Common Core: High School - Algebra : Identify Zeros, Factor and Graph Polynomials: CCSS.Math.Content.HSA-APR.B.3

Study concepts, example questions & explanations for Common Core: High School - Algebra

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All Common Core: High School - Algebra Resources

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Example Questions

Example Question #1 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

What are the \(\displaystyle x\)-intercept(s) of the function?

\(\displaystyle y=x^2-x-6\)

Possible Answers:

\(\displaystyle \text{x-intercepts: }2, 3\)

\(\displaystyle \text{x-intercepts: }2, -3\)

\(\displaystyle \text{x-intercepts:}-2, -3\)

\(\displaystyle \text{x-intercepts:}-2, 3\)

\(\displaystyle \text{x-intercepts:}-1, 6\)

Correct answer:

\(\displaystyle \text{x-intercepts:}-2, 3\)

Explanation:

To find the \(\displaystyle x\)-intercept of a function, first recall that the \(\displaystyle x\)-intercept represents the points where the graph of the function crosses the \(\displaystyle x\)-axis. In other words where the function has a \(\displaystyle y\) value equal to zero.

One technique that can be used is factorization. In general form,

\(\displaystyle y=x^2+bx+c\rightarrow(x+c_1)(x+c_2)\)

where,

\(\displaystyle c_1\) and \(\displaystyle c_2\) are factors of \(\displaystyle c\) and when added together results in \(\displaystyle b\).

For the given function,

 \(\displaystyle y=x^2-x-6\)

the coefficients are,

\(\displaystyle \\b=-1 \\c=-6\)

therefore the factors of \(\displaystyle c\) that have a sum of \(\displaystyle b\) are,

\(\displaystyle y=(x-3)(x+2)\)

Now find the \(\displaystyle x\)-intercepts of the function by setting each binomial equal to zero and solving for \(\displaystyle x\).

\(\displaystyle \\x-3=0\rightarrow x=3 \\x+2=0\rightarrow x=-2\)

To verify, graph the function.

Screen shot 2016 03 08 at 11.06.54 am

The graph crosses the \(\displaystyle x\)-axis at -2 and 3, thus verifying the results found by factorization. 

Example Question #2 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

What are the \(\displaystyle x\)-intercept(s) of the function?

\(\displaystyle y=x^2-7x+12\)

Possible Answers:

\(\displaystyle \text{x-intercepts: }-3,4\)

\(\displaystyle \text{x-intercepts: }-3,-4\)

\(\displaystyle \text{x-intercepts: }3,-4\)

\(\displaystyle \text{x-intercepts: }6,2\)

\(\displaystyle \text{x-intercepts: }3,4\)

Correct answer:

\(\displaystyle \text{x-intercepts: }3,4\)

Explanation:

To find the \(\displaystyle x\)-intercept of a function, first recall that the \(\displaystyle x\)-intercept represents the points where the graph of the function crosses the \(\displaystyle x\)-axis. In other words where the function has a \(\displaystyle y\) value equal to zero.

One technique that can be used is factorization. In general form,

\(\displaystyle y=x^2+bx+c\rightarrow(x+c_1)(x+c_2)\)

where,

\(\displaystyle c_1\) and \(\displaystyle c_2\) are factors of \(\displaystyle c\) and when added together results in \(\displaystyle b\).

For the given function,

 \(\displaystyle y=x^2-7x+12\)

the coefficients are,

\(\displaystyle \\b=-7 \\c=12\)

therefore the factors of \(\displaystyle c\) that have a sum of \(\displaystyle b\) are,

\(\displaystyle y=(x-3)(x-4)\)

Now find the \(\displaystyle x\)-intercepts of the function by setting each binomial equal to zero and solving for \(\displaystyle x\).

\(\displaystyle \\x-3=0\rightarrow x=3 \\x-4=0\rightarrow x=4\)

To verify, graph the function.

Screen shot 2016 03 08 at 12.13.08 pm

The graph crosses the \(\displaystyle x\)-axis at 3 and 4, thus verifying the results found by factorization. 

Example Question #2 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

What are the \(\displaystyle x\)-intercept(s) of the function?

\(\displaystyle y=x^2+9x+18\)

Possible Answers:

\(\displaystyle \text{x-intercepts: }2,9\)

\(\displaystyle \text{x-intercepts: }6,-3\)

\(\displaystyle \text{x-intercepts:}-6,-3\)

\(\displaystyle \text{x-intercepts: }6,3\)

\(\displaystyle \text{x-intercepts:}-6,3\)

Correct answer:

\(\displaystyle \text{x-intercepts:}-6,-3\)

Explanation:

To find the \(\displaystyle x\)-intercept of a function, first recall that the \(\displaystyle x\)-intercept represents the points where the graph of the function crosses the \(\displaystyle x\)-axis. In other words where the function has a \(\displaystyle y\) value equal to zero.

One technique that can be used is factorization. In general form,

\(\displaystyle y=x^2+bx+c\rightarrow(x+c_1)(x+c_2)\)

where,

\(\displaystyle c_1\) and \(\displaystyle c_2\) are factors of \(\displaystyle c\) and when added together results in \(\displaystyle b\).

For the given function,

 \(\displaystyle y=x^2+9x+18\)

the coefficients are,

\(\displaystyle \\b=9 \\c=18\)

therefore the factors of \(\displaystyle c\) that have a sum of \(\displaystyle b\) are,

\(\displaystyle y=(x+3)(x+6)\)

Now find the \(\displaystyle x\)-intercepts of the function by setting each binomial equal to zero and solving for \(\displaystyle x\).

\(\displaystyle \\x+3=0\rightarrow x=-3 \\x+6=0\rightarrow x=-6\)

To verify, graph the function.

Screen shot 2016 03 08 at 12.27.49 pm

The graph crosses the \(\displaystyle x\)-axis at -3 and -6, thus verifying the results found by factorization. 

Example Question #2 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

What are the \(\displaystyle x\)-intercept(s) of the function?

\(\displaystyle y=x^2+2x-8\)

Possible Answers:

\(\displaystyle \text{x-intercepts: }-1,8\)

\(\displaystyle \text{x-intercepts: }-4,-2\)

\(\displaystyle \text{x-intercepts: }4,2\)

\(\displaystyle \text{x-intercepts: }4,-2\)

\(\displaystyle \text{x-intercepts: }-4,2\)

Correct answer:

\(\displaystyle \text{x-intercepts: }-4,2\)

Explanation:

To find the \(\displaystyle x\)-intercept of a function, first recall that the \(\displaystyle x\)-intercept represents the points where the graph of the function crosses the \(\displaystyle x\)-axis. In other words where the function has a \(\displaystyle y\) value equal to zero.

One technique that can be used is factorization. In general form,

\(\displaystyle y=x^2+bx+c\rightarrow(x+c_1)(x+c_2)\)

where,

\(\displaystyle c_1\) and \(\displaystyle c_2\) are factors of \(\displaystyle c\) and when added together results in \(\displaystyle b\).

For the given function,

 \(\displaystyle y=x^2+2x-8\)

the coefficients are,

\(\displaystyle \\b=2 \\c=-8\)

therefore the factors of \(\displaystyle c\) that have a sum of \(\displaystyle b\) are,

\(\displaystyle y=(x-2)(x+4)\)

Now find the \(\displaystyle x\)-intercepts of the function by setting each binomial equal to zero and solving for \(\displaystyle x\).

\(\displaystyle \\x-2=0\rightarrow x=2 \\x+4=0\rightarrow x=-4\)

To verify, graph the function.

Screen shot 2016 03 08 at 12.52.32 pm

The graph crosses the \(\displaystyle x\)-axis at -4 and 2, thus verifying the results found by factorization. 

Example Question #221 : High School: Algebra

What are the \(\displaystyle x\)-intercept(s) of the function?

\(\displaystyle y=x^2+2x+1\)

Possible Answers:

\(\displaystyle \text{x-intercept: }0\)

\(\displaystyle \text{x-intercepts: }-1,0,1\)

\(\displaystyle \text{x-intercepts: }-1,1\)

\(\displaystyle \text{x-intercept: }-1\)

\(\displaystyle \text{x-intercept: }1\)

Correct answer:

\(\displaystyle \text{x-intercept: }-1\)

Explanation:

To find the \(\displaystyle x\)-intercept of a function, first recall that the \(\displaystyle x\)-intercept represents the points where the graph of the function crosses the \(\displaystyle x\)-axis. In other words where the function has a \(\displaystyle y\) value equal to zero.

One technique that can be used is factorization. In general form,

\(\displaystyle y=x^2+bx+c\rightarrow(x+c_1)(x+c_2)\)

where,

\(\displaystyle c_1\) and \(\displaystyle c_2\) are factors of \(\displaystyle c\) and when added together results in \(\displaystyle b\).

For the given function,

 \(\displaystyle y=x^2+2x+1\)

the coefficients are,

\(\displaystyle \\b=2 \\c=1\)

therefore the factors of \(\displaystyle c\) that have a sum of \(\displaystyle b\) are,

\(\displaystyle y=(x+1)(x+1)\)

Now find the \(\displaystyle x\)-intercepts of the function by setting each binomial equal to zero and solving for \(\displaystyle x\).

\(\displaystyle \\x+1=0\rightarrow x=-1\)

To verify, graph the function.

Screen shot 2016 03 08 at 1.07.18 pm

The graph crosses the \(\displaystyle x\)-axis at -1, thus verifying the result found by factorization. 

Example Question #222 : High School: Algebra

What are the \(\displaystyle x\)-intercept(s) of the function?

\(\displaystyle y=x^2+7x+6\)

Possible Answers:

\(\displaystyle \text{x-intercepts: }6,1\)

\(\displaystyle \text{x-intercepts: }-6,1\)

\(\displaystyle \text{x-intercepts: }3,2\)

\(\displaystyle \text{x-intercepts: }-6,-1\)

\(\displaystyle \text{x-intercepts: }6,-1\)

Correct answer:

\(\displaystyle \text{x-intercepts: }-6,-1\)

Explanation:

To find the \(\displaystyle x\)-intercept of a function, first recall that the \(\displaystyle x\)-intercept represents the points where the graph of the function crosses the \(\displaystyle x\)-axis. In other words where the function has a \(\displaystyle y\) value equal to zero.

One technique that can be used is factorization. In general form,

\(\displaystyle y=x^2+bx+c\rightarrow(x+c_1)(x+c_2)\)

where,

\(\displaystyle c_1\) and \(\displaystyle c_2\) are factors of \(\displaystyle c\) and when added together results in \(\displaystyle b\).

For the given function,

 \(\displaystyle y=x^2+7x+6\)

the coefficients are,

\(\displaystyle \\b=7 \\c=6\)

therefore the factors of \(\displaystyle c\) that have a sum of \(\displaystyle b\) are,

\(\displaystyle y=(x+1)(x+6)\)

Now find the \(\displaystyle x\)-intercepts of the function by setting each binomial equal to zero and solving for \(\displaystyle x\).

\(\displaystyle \\x+1=0\rightarrow x=-1 \\x+6=0\rightarrow x=-6\)

To verify, graph the function.

Screen shot 2016 03 08 at 1.27.02 pm

The graph crosses the \(\displaystyle x\)-axis at -6 and -1, thus verifying the results found by factorization. 

Example Question #2 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

What are the \(\displaystyle x\)-intercept(s) of the function?

\(\displaystyle y=x^2+4x+3\)

Possible Answers:

\(\displaystyle \text{x-intercepts:}-3,1\)

\(\displaystyle \text{x-intercepts:}-3,-1\)

\(\displaystyle \text{x-intercepts:}-3,-1,1\)

\(\displaystyle \text{x-intercepts: }3,-1\)

\(\displaystyle \text{x-intercepts: }3,1\)

Correct answer:

\(\displaystyle \text{x-intercepts:}-3,-1\)

Explanation:

To find the \(\displaystyle x\)-intercept of a function, first recall that the \(\displaystyle x\)-intercept represents the points where the graph of the function crosses the \(\displaystyle x\)-axis. In other words where the function has a \(\displaystyle y\) value equal to zero.

One technique that can be used is factorization. In general form,

\(\displaystyle y=x^2+bx+c\rightarrow(x+c_1)(x+c_2)\)

where,

\(\displaystyle c_1\) and \(\displaystyle c_2\) are factors of \(\displaystyle c\) and when added together results in \(\displaystyle b\).

For the given function,

 \(\displaystyle y=x^2+4x+3\)

the coefficients are,

\(\displaystyle \\b=4 \\c=3\)

therefore the factors of \(\displaystyle c\) that have a sum of \(\displaystyle b\) are,

\(\displaystyle y=(x+1)(x+3)\)

Now find the \(\displaystyle x\)-intercepts of the function by setting each binomial equal to zero and solving for \(\displaystyle x\).

\(\displaystyle \\x+1=0\rightarrow x=-1 \\x+3=0\rightarrow x=-3\)

To verify, graph the function.

Screen shot 2016 03 08 at 1.52.17 pm

The graph crosses the \(\displaystyle x\)-axis at -1 and -3, thus verifying the results found by factorization. 

Example Question #4 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

What are the \(\displaystyle x\)-intercept(s) of the function?

\(\displaystyle y=x^2-2x+1\)

Possible Answers:

\(\displaystyle \text{x-intercept: }0\)

\(\displaystyle \text{x-intercepts: }0,1\)

\(\displaystyle \text{x-intercepts: }1,-1\)

\(\displaystyle \text{x-intercept: }-1\)

\(\displaystyle \text{x-intercept: }1\)

Correct answer:

\(\displaystyle \text{x-intercept: }1\)

Explanation:

To find the \(\displaystyle x\)-intercept of a function, first recall that the \(\displaystyle x\)-intercept represents the points where the graph of the function crosses the \(\displaystyle x\)-axis. In other words where the function has a \(\displaystyle y\) value equal to zero.

One technique that can be used is factorization. In general form,

\(\displaystyle y=x^2+bx+c\rightarrow(x+c_1)(x+c_2)\)

where,

\(\displaystyle c_1\) and \(\displaystyle c_2\) are factors of \(\displaystyle c\) and when added together results in \(\displaystyle b\).

For the given function,

 \(\displaystyle y=x^2-2x+1\)

the coefficients are,

\(\displaystyle \\b=-2 \\c=1\)

therefore the factors of \(\displaystyle c\) that have a sum of \(\displaystyle b\) are,

\(\displaystyle y=(x-1)(x-1)\)

Now find the \(\displaystyle x\)-intercepts of the function by setting each binomial equal to zero and solving for \(\displaystyle x\).

\(\displaystyle \\x-1=0\rightarrow x=1\)

To verify, graph the function.

Screen shot 2016 03 09 at 9.54.14 am

The graph crosses the \(\displaystyle x\)-axis at 1, thus verifying the result found by factorization. 

Example Question #7 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

What are the \(\displaystyle x\)-intercept(s) of the function?

\(\displaystyle y=x^2-8x+7\)

Possible Answers:

\(\displaystyle \text{x-intercepts: }1,8\)

\(\displaystyle \text{x-intercepts: }-1,7\)

\(\displaystyle \text{x-intercepts: }-1,-7\)

\(\displaystyle \text{x-intercepts: }1,7\)

\(\displaystyle \text{x-intercepts: }1,-7\)

Correct answer:

\(\displaystyle \text{x-intercepts: }1,7\)

Explanation:

To find the \(\displaystyle x\)-intercept of a function, first recall that the \(\displaystyle x\)-intercept represents the points where the graph of the function crosses the \(\displaystyle x\)-axis. In other words where the function has a \(\displaystyle y\) value equal to zero.

One technique that can be used is factorization. In general form,

\(\displaystyle y=x^2+bx+c\rightarrow(x+c_1)(x+c_2)\)

where,

\(\displaystyle c_1\) and \(\displaystyle c_2\) are factors of \(\displaystyle c\) and when added together results in \(\displaystyle b\).

For the given function,

 \(\displaystyle y=x^2-8x+7\)

the coefficients are,

\(\displaystyle \\b=-8 \\c=7\)

therefore the factors of \(\displaystyle c\) that have a sum of \(\displaystyle b\) are,

\(\displaystyle y=(x-1)(x-7)\)

Now find the \(\displaystyle x\)-intercepts of the function by setting each binomial equal to zero and solving for \(\displaystyle x\).

\(\displaystyle \\x-1=0\rightarrow x=1 \\x-7=0\rightarrow x=7\)

To verify, graph the function.

Screen shot 2016 03 09 at 10.02.27 am

The graph crosses the \(\displaystyle x\)-axis at 1 and 7, thus verifying the results found by factorization. 

Example Question #4 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

What are the \(\displaystyle x\)-intercept(s) of the function?

\(\displaystyle y=x^2-5x+6\)

Possible Answers:

\(\displaystyle \text{x-intercepts: }2,3\)

\(\displaystyle \text{x-intercepts: }2,-3\)

\(\displaystyle \text{x-intercepts: }-2,3\)

\(\displaystyle \text{x-intercepts: }2,1\)

\(\displaystyle \text{x-intercepts: }-2,-3\)

Correct answer:

\(\displaystyle \text{x-intercepts: }2,3\)

Explanation:

To find the \(\displaystyle x\)-intercept of a function, first recall that the \(\displaystyle x\)-intercept represents the points where the graph of the function crosses the \(\displaystyle x\)-axis. In other words where the function has a \(\displaystyle y\) value equal to zero.

One technique that can be used is factorization. In general form,

\(\displaystyle y=x^2+bx+c\rightarrow(x+c_1)(x+c_2)\)

where,

\(\displaystyle c_1\) and \(\displaystyle c_2\) are factors of \(\displaystyle c\) and when added together results in \(\displaystyle b\).

For the given function,

 \(\displaystyle y=x^2-5x+6\)

the coefficients are,

\(\displaystyle \\b=-5 \\c=6\)

therefore the factors of \(\displaystyle c\) that have a sum of \(\displaystyle b\) are,

\(\displaystyle y=(x-2)(x-3)\)

Now find the \(\displaystyle x\)-intercepts of the function by setting each binomial equal to zero and solving for \(\displaystyle x\).

\(\displaystyle \\x-2=0\rightarrow x=2 \\x-3=0\rightarrow x=3\)

To verify, graph the function.

Screen shot 2016 03 09 at 10.10.58 am

The graph crosses the \(\displaystyle x\)-axis at 2 and 3, thus verifying the results found by factorization. 

All Common Core: High School - Algebra Resources

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