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

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Example Question #21 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

Find the zeros of $- 3 x^{2} + 24 x + 87$

Possible Answers:

-24 , 24

$18 \sqrt{5} , - 18 \sqrt{5}$

$4 + 3 \sqrt{5} , - 3 \sqrt{5} + 4$

There are no real roots

Correct answer:

$4 + 3 \sqrt{5} , - 3 \sqrt{5} + 4$

Explanation:

In order to find the zeros, we can use the quadratic formula.

Recall the quadratic formula.

$x =\frac{ - b \pm \sqrt{- 4 a c + b^{2}} }{ 2 a }$

Where $\uptext{a}$ , $\uptext{b}$ , and $\uptext{c}$ , correspond to the coefficients in the equation

$a x^{2} + b x + c = 0$

In this case a = -3 , b = 24 , and c = 87

We plug in these values into the quadratic formula, and evaluate them.

$x =\frac{ -24 \pm \sqrt{ 24 ^2 - 4 * -3 * 87 }}{ 2 * -3 }$

$x =\frac{ -24 \pm \sqrt{ 576 - -1044 }}{ -6 }$

$x =\frac{ -24 \pm \sqrt{ 1620 }}{ -6 }$

$x =\frac{ -24 \pm 18 \sqrt{5} }{ -6 }$

Now we split this up into two equations.

$x =\frac{ -24 + 18 \sqrt{5} }{ -6 }$

$x =\frac{ -24 - 18 \sqrt{5} }{ -6 }$

So our zeros are at

$x = 4 + 3 \sqrt{5}$

$x = - 3 \sqrt{5} + 4$

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Example Question #22 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

Find the zeros of $- x^{2} + 18 x - 53$

Possible Answers:

-18 , 18

There are no real roots

$4 \sqrt{7} , - 4 \sqrt{7}$

$- 2 \sqrt{7} + 9 , 2 \sqrt{7} + 9$

Correct answer:

$- 2 \sqrt{7} + 9 , 2 \sqrt{7} + 9$

Explanation:

$a x^{2} + b x + c = 0$

In this case a = -1 , b = 18 , and c = -53

We plug in these values into the quadratic formula, and evaluate them.

$x =\frac{ -18 \pm \sqrt{ 18 ^2 - 4 * -1 * -53 }}{ 2 * -1 }$

$x =\frac{ -18 \pm \sqrt{ 324 - 212 }}{ -2 }$

$x =\frac{ -18 \pm \sqrt{ 112 }}{ -2 }$

$x =\frac{ -18 \pm 4 \sqrt{7} }{ -2 }$

Now we split this up into two equations.

$x =\frac{ -18 + 4 \sqrt{7} }{ -2 }$

$x =\frac{ -18 - 4 \sqrt{7} }{ -2 }$

So our zeros are at

$x = - 2 \sqrt{7} + 9$

$x = 2 \sqrt{7} + 9$

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Example Question #23 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

Find the zeros of $- 7 x^{2} + 34 x + 16$

Possible Answers:

$2 \sqrt{401} , - 2 \sqrt{401}$

-34 , 34

There are no real roots

$\frac{17}{7} + \frac{\sqrt{401}}{7} , - \frac{\sqrt{401}}{7} + \frac{17}{7}$

Correct answer:

$\frac{17}{7} + \frac{\sqrt{401}}{7} , - \frac{\sqrt{401}}{7} + \frac{17}{7}$

Explanation:

In order to find the zeros, we can use the quadratic formula.

Recall the quadratic formula.

$x =\frac{ - b \pm \sqrt{- 4 a c + b^{2}} }{ 2 a }$

Where $\uptext{a}$ , $\uptext{b}$ , and $\uptext{c}$ , correspond to the coefficients in the equation

$a x^{2} + b x + c = 0$

In this case a = -7 , b = 34 , and c = 16

We plug in these values into the quadratic formula, and evaluate them.

$x =\frac{ -34 \pm \sqrt{ 34 ^2 - 4 * -7 * 16 }}{ 2 * -7 }$

$x =\frac{ -34 \pm \sqrt{ 1156 - -448 }}{ -14 }$

$x =\frac{ -34 \pm \sqrt{ 1604 }}{ -14 }$

$x =\frac{ -34 \pm 2 \sqrt{401} }{ -14 }$

Now we split this up into two equations.

$x =\frac{ -34 + 2 \sqrt{401} }{ -14 }$

$x =\frac{ -34 - 2 \sqrt{401} }{ -14 }$

So our zeros are at

$x = \frac{17}{7} + \frac{\sqrt{401}}{7}$

$x = - \frac{\sqrt{401}}{7} + \frac{17}{7}$

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Example Question #24 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

Find the zeros of $5 x^{2} + 17 x - 21$

Possible Answers:

-17 , 17

$\sqrt{709} , - \sqrt{709}$

There are no real roots

$- \frac{17}{10} + \frac{\sqrt{709}}{10} , - \frac{\sqrt{709}}{10} - \frac{17}{10}$

Correct answer:

$- \frac{17}{10} + \frac{\sqrt{709}}{10} , - \frac{\sqrt{709}}{10} - \frac{17}{10}$

Explanation:

$a x^{2} + b x + c = 0$

In this case a = 5 , b = 17 , and c = -21 .

We plug in these values into the quadratic formula, and evaluate them.

$x =\frac{ -17 \pm \sqrt{ 17 ^2 - 4 * 5 * -21 }}{ 2 * 5 }$

$x =\frac{ -17 \pm \sqrt{ 289 - -420 }}{ 10 }$

$x =\frac{ -17 \pm \sqrt{ 709 }}{ 10 }$

Now we split this up into two equations.

$x =\frac{ -17 + \sqrt{709} }{ 10 }$

$x =\frac{ -17 - \sqrt{709} }{ 10 }$

So our zeros are at

$x = - \frac{17}{10} + \frac{\sqrt{709}}{10}$

$x = - \frac{\sqrt{709}}{10} - \frac{17}{10}$

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Example Question #25 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

What are the -intercept(s) of the function?

y=x^2+10x+25

Possible Answers:

$\text{x-intercept: }x=5$

$\text{x-intercepts: }x=-5 \text{ and } x=5$

$\text{x-intercepts: }x=-5 \text{ and } x=-1$

$\text{x-intercepts: }x=-5 \text{ and } x=0$

$\text{x-intercept: }x=-5$

Correct answer:

$\text{x-intercept: }x=-5$

Explanation:

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

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

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

where,

c_1 and c_2 are factors of and when added together results in .

For the given function,

y=x^2+10x+25

the coefficients are,

$\\b=10 \\c=25$

therefore the factors of that have a sum of are,

y=(x+5)(x+5)

Now find the -intercepts of the function by setting each binomial equal to zero and solving for .

$\\x+5=0\rightarrow x=-5$

To verify, graph the function.

Screen shot 2016 03 09 at 10.24.54 am

The graph crosses the -axis at -5, thus verifying the result found by factorization.

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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

All Common Core: High School - Algebra Resources

Example Questions

Example Question #21 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

Example Question #22 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

Example Question #23 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

Example Question #24 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

Example Question #25 : Identify Zeros, Factor And Graph Polynomials: Ccss.Math.Content.Hsa Apr.B.3

All Common Core: High School - Algebra Resources

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