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SAT II Math I : Single-Variable Algebra

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Example Question #3 : Simplifying Expressions

Which of the following linear binomials is a factor of the polynomial $x^{3} -34x- 240$ ?

Possible Answers:

x - 8

x+6

x + 4

x- 6

x -10

Correct answer:

x - 8

Explanation:

By the factor theorem, a polynomial p (x) is divisible by the linear binomial x - c if and only if p(c) = 0 . We can use this fact to test each of the binomials by evaluating the dividend for the appropriate value of .

x + 4 : Evaluate the polynomial at x = -4 :

$x^{3} -34x- 240 = (-4)^{3} -34(-4)- 240 = -64 +136 - 240 = -170 \neq 0$

x + 6 : Evaluate the polynomial at x = -6 :

$x^{3} -34x- 240 = (-6)^{3} -34(-6)- 240 = -216+204 -240= -252 \neq 0$

x- 6 : Evaluate the polynomial at x = 6 :

$x^{3} -34x- 240 =6^{3} -34(6)- 240 = 216-204 -240= -228 \neq 0$

x- 8 : Evaluate the polynomial at x = 8 :

$x^{3} -34x- 240 =8^{3} -34(8)- 240 = 512-272 -240= 0$

x- 10 : Evaluate the polynomial at x = 10 :

$x^{3} -34x- 240 =10^{3} -34(10)- 240 = 1,000-340 -240= 420$

The dividend assumes the value of 0 at x = 8 , so of the choices given, x- 8 is the factor.

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Example Question #1 : Simplifying Expressions

What is 3t+ 7 increased by 40%?

Possible Answers:

4.2 t + 9.8

4.2+7

1.2t+2.8

3t+47

3t+ 9.8

Correct answer:

4.2 t + 9.8

Explanation:

A number increased by 40% is equivalent to 100% of the number plus 40% of the number. This is taking 140% of the number, or, equivalently, multiplying it by 1.4.

Therefore, 3t+ 7 increased by 40% is 1.4 times this, or

$1.4 \left (3t+ 7 \right ) = 1.4 \cdot 3t + 1.4 \cdot 7 = 4.2 t + 9.8$

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Example Question #2 : Simplifying Expressions

Which of the following is a prime factor of $x^{6} - 1$ ?

Possible Answers:

$x^{3} +3 x + 1$

$x^{3} + 2x + 1$

$x^{2} + x + 1$

$x^{2} + 1$

$x^{2} +3 x + 1$

Correct answer:

$x^{2} + x + 1$

Explanation:

$x^{6} - 1$ is the difference of two squares:

$x^{6} - 1 =\left ( x^{3} \right ) ^{2}- 1$

As such, it can be factored as follows:

$x^{6} - 1 =\left ( x^{3} \right ) ^{2}- 1 = \left ( x^{3} + 1 \right ) \left ( x^{3} - 1 \right )$

The first factor is the sum of cubes and the second is the difference of cubes; each can be factored further:

$x^{3} +1 = (x+1) \left ( x^{2}-x \cdot 1 + 1^{2} \right ) = (x+1) \left ( x^{2} - x + 1 \right )$

$x^{3} - 1 = (x-1) \left ( x^{2} + x \cdot 1 + 1^{2} \right ) = (x-1) \left ( x^{2} + x + 1 \right )$

Therefore,

$x^{6} - 1 = \left ( x^{3} + 1 \right ) \left ( x^{3} - 1 \right ) = (x+1) \left ( x^{2} - x + 1 \right ) (x-1) \left ( x^{2} + x + 1 \right )$

Of the choices, $x^{2} + x + 1$ appears in the prime factorization and is therefore the correct choice.

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Example Question #1 : Simplifying Expressions

Decrease 9x + 4y by 20%. Which of the following will this be equal to?

Possible Answers:

7.2x + 4y

9x + 3.2y

7.2x + 3.2y

1.8x+4y

1.8x+0.8y

Correct answer:

7.2x + 3.2y

Explanation:

A number decreased by 20% is equivalent to 100% of the number minus 20% of the number. This is taking 80% of the number, or, equivalently, multiplying it by 0.8.

Therefore, 9x + 4y decreased by 20% is 0.8 times this, or

$0.8 \left (9x + 4y \right ) = 0.8 \cdot 9x + 0.8 \cdot 4y = 7.2x + 3.2y$

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Example Question #1 : Simplifying Expressions

Divide:

$\left ( 12 x ^{4} + 16x^{3}+ 64x^{2}+8 x \right ) \div 8x^{2}$

Possible Answers:

$\frac{ 3 }{ 2 }x ^{3} + 2x^{2} + 8x + 1$

$\frac{ 3 }{ 2 }x ^{3} + 2x^{2} + 8x$

$\frac{ 3 }{ 2 }x ^{2} + 2x + 8 + \frac{1}{x}$

$\frac{ 3 }{ 2 }x ^{3} + 3x^{2} + 8x$

$\frac{ 3 }{ 2 }x ^{2} + 3x + 8$

Correct answer:

$\frac{ 3 }{ 2 }x ^{2} + 2x + 8 + \frac{1}{x}$

Explanation:

Divide termwise:

$\left ( 12 x ^{4} + 16x^{3}+ 64x^{2}+8 x \right ) \div 8x^{2}$

$=\frac{ 12 x ^{4} + 16x^{3}+ 64x^{2}+8 x }{ 8x^{2}}$

$=\frac{ 12 x ^{4} }{ 8x^{2}} + \frac{ 16x^{3} }{ 8x^{2}} + \frac{ 64x^{2} }{ 8x^{2}} +\frac{ 8 x }{ 8x^{2}}$

$=\frac{ 12 }{ 8 }x ^{4-2} + \frac{ 16 }{ 8}x^{3-2} + \frac{ 64 }{ 8 } +\frac{ 8 }{ 8} \cdot \frac{1}{x^{2-1}}$

$=\frac{ 3 }{ 2 }x ^{2} + 2x + 8 + \frac{1}{x}$

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Example Question #111 : Single Variable Algebra

Simplify the expression:

$\frac{x^2+2x-8}{x+4}$

Possible Answers:

x+2

x-2

x+4

x-4

Correct answer:

x-2

Explanation:

To solve this problem, we first need to factor the numerator. We are looking for two numbers that multiply to equal -8 and sum to equal 2.

4*(-2)=-8

4+(-2)=2

Now, we can write out our expression in fraction form.

$\frac{(x+4)(x-2)}{x+4}$

Since we have the like term x+4 in the numerator and denominator, we can cancel them out of our expression.

$\frac{(x+4)(x-2)}{x+4}= x-2$

Thus, our answer is x-2 .

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Example Question #1 : Simplifying Expressions

Simplify:

$\frac{(x^5y^2z^3)(x^2yz)}{x^4y^{-3}z^3}$

Possible Answers:

x^6y^5

x^3z

x^4y^1z

x^3y^6z

x^3y^5z

Correct answer:

x^3y^6z

Explanation:

To simplify, we begin by simplifying the numerator. When muliplying like bases with different exponents, their exponents are added.

For x: $\small 4+3=7$

For y: $\small 2+1=3$

For z: $\small 3+1=4$

The numerator is now x^7y^3z^4 .

When dividing like bases, their exponents are subtracted.

For x: $\small 7-4=3$

For y: $\small 3-(-3)=6$

For z: $\small 4-3=1$

Thus, our answer is x^3y^6z .

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Example Question #11 : Simplifying Expressions

Decrease 6y + 17 by 30%. Which of the following will this be equal to?

Possible Answers:

The correct answer is not among the other responses.

1.8y +5.1

4.2y + 11.9

6y-13

4.2y + 17

Correct answer:

4.2y + 11.9

Explanation:

A number decreased by 30% is equivalent to 100% of the number minus 30% of the number. This is taking 70% of the number, or, equivalently, multiplying it by 0.7.

Therefore, 6y + 17 decreased by 30% is 0.7 times this, or

$0.7 \left (6y + 17 \right ) = 0.7 \cdot 6y +0.7 \cdot 17 = 4.2y + 11.9$

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Example Question #271 : Sat Subject Test In Math I

The polynomial $x^{4} - 27x^{2}+ 5x - A$ is divisible by the linear binomial x - 6 . Evaluate .

Possible Answers:

A =294

A = 354

A = - 354

None of the other choices gives the correct answer.

A =-294

Correct answer:

A = 354

Explanation:

By the factor theorem, a polynomial p (x) is divisible by the linear binomial x - c if and only if p(c) = 0 . Therefore, we want the value of that makes the polynomial equal to 0 when evaluated at x = 6 .

$x^{4} - 27x^{2}+ 5x - A = 0$

$6^{4} - 27 \cdot 6^{2}+ 5 \cdot 6 - A = 0$

$1,296- 27 \cdot 36+ 30- A = 0$

1,296- 972+ 30- A = 0

354- A = 0

354=A

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Example Question #271 : Sat Subject Test In Math I

Factor:

$125T^{3}+729$

Possible Answers:

$(5T+9)(5T-9)^{2}$

$(5T+9)(25T^{2}+45T +81)$

$(5T+9)(25T^{2}-45T +81)$

$(5T+9)^{3}$

$(5T+9)(25T^{2}+81)$

Correct answer:

$(5T+9)(25T^{2}-45T +81)$

Explanation:

$125T^{3}+729$ can be rewritten as $(5T)^{3} + 9^{3}$ and is therefore the sum of two cubes. As such, it can be factored using the pattern

$A^{3}+B^{3} =(A+B) (A^{2}-AB +B^{2})$

where A = 5T, B = 9 .

$125T^{3}+729$

$=(5T)^{3} + 9^{3}$

$= (5T+9)[(5T)^{2}-5T \cdot 9 +9^{2}]$

$= (5T+9)(25T^{2}-45T +81)$

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SAT II Math I : Single-Variable Algebra

Study concepts, example questions & explanations for SAT II Math I

All SAT II Math I Resources

Example Questions

Example Question #3 : Simplifying Expressions

Example Question #1 : Simplifying Expressions

Example Question #2 : Simplifying Expressions

Example Question #1 : Simplifying Expressions

Example Question #1 : Simplifying Expressions

Example Question #111 : Single Variable Algebra

Example Question #1 : Simplifying Expressions

Example Question #11 : Simplifying Expressions

Example Question #271 : Sat Subject Test In Math I

Example Question #271 : Sat Subject Test In Math I

All SAT II Math I Resources

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