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SAT II Math II : Single-Variable Algebra

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Example Questions

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Example Question #9 : Factoring And Finding Roots

A cubic polynomial p(x) with rational coefficients and with $x^{3}$ as its leading term has 2 and 3 as its only zeroes. 2 is a zero of multiplicity 1.

Which of the following is this polynomial?

Possible Answers:

$p(x) = x^{3} + 8x^{2} + 21x + 18$

$p(x) = x^{3} + 7x^{2} + 16x + 12$

$p(x) = x^{3} - 7x^{2} + 16x- 12$

$p(x) = x^{3} - 8x^{2} + 21x - 18$

Insufficient information exists to determine the polynomial.

Correct answer:

$p(x) = x^{3} - 8x^{2} + 21x - 18$

Explanation:

A cubic polynomial has three zeroes, if a zero of multiplicity is counted times. Since its lead term is $x^{3}$ , we know that, in factored form,

$p(x) = (x-b_{1}) (x-b_{2}) (x-b_{3})$ ,

where $b_{1}$ , $b_{2}$ , and $b_{3}$ are its zeroes.

Since 2 is a zero of multiplicity 1, its only other zero, 3, must be a zero of multiplicity 2.

Therefore, we can set $b_{1} = 2$ , $b_{2} = b_{3}= 3$ , in the factored form of p(x) , and

p(x) = (x-2) (x-3) (x-3) ,

$p(x) = (x-2) (x-3) ^{2}$

To rewrite this, firs square x -3 by way of the square of a binomial pattern:

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

$(x-3)^{2} = x^{2} - 6x + 9$

Thus,

$p(x) = (x-2) ( x^{2} - 6x + 9)$

Multiplying:

$x^{2} - 6x + 9$

$\underline{x - 2}$

$-2x^{2} +12x - 18$

$\underline{x^{3} - 6x^{2} + 9x}$ ________

$x^{3} - 8x^{2} + 21x - 18$ ,

the correct polynomial.

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Example Question #81 : Single Variable Algebra

Give the set of all real solutions of the equation $2x -11x^{\frac{1}{2}}+15 = 0$ .

Possible Answers:

$\left \{-9, 9 \right \}$

$\left \{ 6\frac{1}{4}, 9 \right \}$

The equation has no real solutions.

$\left \{ - 6\frac{1}{4} , 6\frac{1}{4} \right \}$

$\left \{ - 6\frac{1}{4}, -9 \right \}$

Correct answer:

$\left \{ 6\frac{1}{4}, 9 \right \}$

Explanation:

Set $y = x^{\frac{1}{2}}$ . Then $x = \left (x^{\frac{1}{2}} \right )^{2} = y ^{2}$ .

$2x -11x^{\frac{1}{2}}+15 = 0$ can be rewritten as

$2\left (x^{\frac{1}{2}} \right )^{2} -11 \left (x^{\frac{1}{2}} \right )+15 = 0$

Substituting $y^{2}$ for and for $x^{\frac{1}{2}}$ , the equation becomes

$2y ^{2} -11 y +15 = 0$

a quadratic equation in .

This can be solved using the method. We are looking for two integers whose sum is and whose product is $2\cdot 15 = 30$ . Through some trial and error, the integers are found to be and , so the above equation can be rewritten, and solved using grouping, as

$2y ^{2} -6y -5y +15 = 0$

$(2y ^{2} -6y) - (5y-15 )= 0$

2y (y-3) -5(y-3) = 0

(2y -5) (y-3) = 0

By the Zero Product Principle, one of these factors is equal to zero:

Either:

2y-5 = 0

2y - 5 + 5 = 0 + 5

2y = 5

$\frac{2y }{2}= \frac{5}{2}$

$y= \frac{5}{2}$

Substituting back:

$x^{\frac{1}{2}} = \frac{5}{2}$ , or $\sqrt{x} = \frac{5}{2}$

$(\sqrt{x} )^{2}= \left (\frac{5}{2} \right )^{2}$

$x = \frac{25}{4} = 6\frac{1}{4}$

Or:

y - 3 = 0

y - 3 + 3 = 0 + 3

y = 3

Substituting back:

$x^{\frac{1}{2}} =3$ , or $\sqrt{x} = 3$

$(\sqrt{x} )^{2}= 3^{2}$

x =9

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Example Question #82 : Single Variable Algebra

Define a function $f(x) = x^{2} - \cos 4x$ .

f(c) = 3 for exactly one positive value of ; this is on the interval (0,5) . Which of the following is true of ?

Possible Answers:

$c \in (1, 2)$

$c \in (4,5 )$

$c \in (0, 1)$

$c \in (3, 4)$

$c \in (2, 3)$

Correct answer:

$c \in (1, 2)$

Explanation:

Define $g(x)= f(x) - 3 = x^{2} - \cos 4x- 3$ . Then, if g(c)= f(c) - 3= 0 , it follows that f(c) = 3 .

By the Intermediate Value Theorem (IVT), if g(x) is a continuous function, and g(a) and g(b) are of unlike sign, then g(c) = 0 for some $c \in (a, b)$ . and $\cos 2x$ are both continuous everywhere, so g(x) is a continuous function, so the IVT applies here.

Evaluate g(x) for each of the following values: $\left \{ 0, 1, 2, 3, 4, 5 \right \}$ :

$g(x) = x^{2} - \cos 4x- 3$

$g(0) =0^{2} - \cos 4 (0)- 3$

$=0 - \cos 0- 3$

=0 -1- 3

= -4

$g(1) =1^{2} - \cos 4 (1)- 3$

$=1 - \cos 4- 3$

$\approx 1 - ( -0.65 ) - 3$

$\approx -1.35$

$g(2) =2^{2} - \cos 4 (2)- 3$

$\approx 4 - ( -0.15) - 3$

$\approx 1.15$

$g(3) =3^{2} - \cos 4 (3)- 3$

$\approx 9- 0.84 - 3$

$\approx 5.16$

$g(4) =4^{2} - \cos 4 (4)- 3$

$\approx 16 - (-0.96 )- 3$

$\approx 13.96$

$g(5) =5^{2} - \cos 4 (5)- 3$

$\approx 25 - 0.41 - 3$

$\approx 21.59$

Only in the case of (1, 2) does it hold that g (x) assumes a different sign at the endpoints - g(1) < 0 < g(2) . By the IVT, g(c) = 0 , and f(c) = 3 , for some $c \in (1, 2)$ .

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Example Question #83 : Single Variable Algebra

Which of the following is a cube root of ?

Possible Answers:

$2+ 2 i \sqrt{3}$

$2+ 2 \sqrt{3}$

$2 + 2 i \sqrt{5}$

$2 + 2 \sqrt{5}$

None of the other choices gives a correct response.

Correct answer:

$2+ 2 i \sqrt{3}$

Explanation:

Let be a cube root of . The question is to find a solution of the equation

$x^{3} =- 64$ .

One way to solve this is to add 64 to both sides:

$x^{3} + 64 =- 64 + 64$

$x^{3} + 64 =0$

64 is a perfect cube, so, as the sum of cubes, the left expression can be factored:

$x^{3} + 4 ^{3} =0$

$(x+ 4 )(x^{2} - x \cdot 4 + 4 ^{2}) = 0$

$(x+ 4 )(x^{2} - 4x + 16) = 0$

We can set both factors equal to zero and solve:

x + 4 = 0

x =- 4

is a cube root of ; however, this is not one of the choices.

Setting

$x^{2} - 4x + 16 = 0$ ,

we can make use of the quadratic formula, setting a = 1, b= -4, c= 16 in the following:

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

$x = \frac{-(-4) \pm \sqrt{(-4)^{2}-4(1)(16)}}{2(1)}$

$x = \frac{4 \pm \sqrt{16-64}}{2}$

$x = \frac{4 \pm \sqrt{-48 }}{2}$

$x = \frac{4 \pm i \sqrt{48 }}{2}$

$x = \frac{4 \pm i \sqrt{16} \cdot \sqrt{3}}{2}$

$x = \frac{4 \pm 4 i \sqrt{3}}{2}$

$x = 2 \pm 2 i \sqrt{3}$

$2 - 2 i \sqrt{3}$ and $2 + 2 i \sqrt{3}$ are both cube roots of ; $2 - 2 i \sqrt{3}$ is not a choice, but $2 + 2 i \sqrt{3}$ is.

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Example Question #84 : Single Variable Algebra

A polynomial of degree 4 has as its lead term $x^{4}$ and has rational coefficients. Two of its zeroes are 4+i and 5+i What is this polynomial?

Possible Answers:

$P(x)= x^{4} +18x^{3} + 129x^{2}+342 x+360$

Insufficient information exists to determine the polynomial.

$P(x)= x^{4} - 18x^{3} + 123x^{2} - 378x+442$

$P(x)= x^{4} - 18x^{3} + 129x^{2}-342 x+360$

$P(x)= x^{4} +18x^{3} + 123x^{2}+378x+442$

Correct answer:

$P(x)= x^{4} - 18x^{3} + 123x^{2} - 378x+442$

Explanation:

A fourth-degree, or quartic, polynomial has four zeroes, if a zero of multiplicity is counted times. Since its lead term is $x^{4}$ , we know that

$p(x) = (x-b_{1}) (x-b_{2}) (x-b_{3})(x-b_{4})$

A polynomial with rational coefficients has its imaginary zeroes in conjugate pairs. Since p(x) is such a polynomial, then, since 4+i is a zero, so is its complex conjugate 4 -i ; similarly, since 5+i is a zero, so is its complex conjugate 5-i . Substituting these four values for the four $b_{n}$ values:

p(x) = [x- (4+i)] [x-(4-i)] [x- (5+i)] [x-(5-i)]

This can be rewritten as

p(x) = [x- 4- i] [x- 4 + i] [x- 5 - i] [x- 5+ i]

p(x) = [(x- 4) - i] [(x- 4) + i] [(x- 5) - i] [(x- 5) + i]

Multiply the first two factors using the difference of squares pattern, then the square of a binomial pattern:

[(x- 4) - i] [(x- 4) + i]

$= (x-4)^{2} - i^{2}$

$= x^{2} -2 \cdot x \cdot 4 + 4^{2} - (-1)$

$= x^{2} -8x + 16 +1$

$= x^{2} -8x + 17$

Multiply the last two factors similarly:

[(x- 5) - i] [(x- 5) + i]

$= (x-5)^{2} - i^{2}$

$= x^{2} -2 \cdot x \cdot 5 + 5^{2} - (-1)$

$= x^{2} -10x + 25+1$

$= x^{2} -10x + 26$

Thus,

$p(x)= ( x^{2} -8x + 17) ( x^{2} -10x + 26)$

Multiply:

$x^{2} -8x + 17$

$\underline{ x^{2} -10x + 26}$

$26 x^{2} -208 x +442$

$-10 x^{3} +80x^{2} -170x$

$\underline{x^{4} -8x^{3} +17x^{2}}$ ________________

$x^{4} - 18x^{3} + 123x^{2} - 378x+442$ .

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Example Question #531 : Sat Subject Test In Math Ii

Define a function $p (x) = x ^{6} - 7x^{4}$ .

p (c) = 5 for exactly one value of on the interval (0, 5) . Which statement is true about ?

Possible Answers:

$c \in (0.1)$

$c \in (4,5)$

$c \in (3,4)$

$c \in (1,2)$

$c \in (2,3)$

Correct answer:

$c \in (2,3)$

Explanation:

Define $g(x) = p(x) -5 = x ^{6} - 7x^{4} -5$ . Then, if g(c) = p(c) -5 = 0 , it follows that p(c) = 5 .

By the Intermediate Value Theorem (IVT), if g(x) is a continuous function, and g(a) and g(b) are of unlike sign, then g(c) = 0 for some $c \in (a, b)$ . As a polynomial, g(x) is a continuous function, so the IVT applies here.

Evaluate g(x) for each of the following values: $\left \{ 0, 1, 2, 3, 4, 5 \right \}$ :

$g(x) = x ^{6} - 7x^{4} -5$

$g(0) = 0 ^{6} - 7 \cdot 0 ^{4} -5$

= 0 - 0 - 5

= -5

$g(1) = 1 ^{6} - 7 \cdot 1 ^{4} -5$

= 1 - 7 - 5

= -11

$g(2) = 2 ^{6} - 7 \cdot 2 ^{4} -5$

$=64 - 7 \cdot 16 -5$

=64 - 112 -5

= -53

$g(3) =3 ^{6} - 7 \cdot 3 ^{4} -5$

$=729 - 7 \cdot 81 -5$

=729 - 567-5

=157

$g(4) =4 ^{6} - 7 \cdot 4 ^{4} -5$

$=4,096 - 7 \cdot 256 -5$

=4,096 -1,792 -5

=2,299

$g(5) =5 ^{6} - 7 \cdot 5 ^{4} -5$

$= 15,625 - 7 \cdot 625 -5$

= 15,625 - 4,375 -5

= 11,245

Only in the case of (2,3) does it hold that g (x) assumes different signs at the endpoints - g(2) < 0 < g(3) . By the IVT, g(c) = 0 , and f(c) = 5 , for some $c \in (2,3)$ .

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Example Question #531 : Sat Subject Test In Math Ii

What is a possible root to y=2x^2-9x-5 ?

Possible Answers:

$-\frac{1}{2}$

$\frac{2}{9}$

$-\frac{3}{2}$

$\frac{1}{2}$

Correct answer:

$-\frac{1}{2}$

Explanation:

Factor the trinomial.

The multiples of the first term is 1,2 .

The multiples of the third term is 1,5 .

We can then factor using these terms.

y=(2x+1)(x-5)

Set the equation to zero.

0=(2x+1)(x-5)

This means that each product will equal zero.

2x+1 = 0 , x-5 = 0

The roots are either $x=-\frac{1}{2} , -5$

The answer is: $-\frac{1}{2}$

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Example Question #81 : Single Variable Algebra

Which of the following could be a solution for the equation x^2-17x+30=0 ?

Possible Answers:

x=-2

x=-15

There are no solutions for the equation.

x=2

Correct answer:

x=2

Explanation:

From the discriminant, b^2-4ac , we know that this equation will have two solutions:

(-17)^2-4(1)(30)>0

Next, factor the equation x^2-17x+30=0 .

(x-5)(x-12)=0

Finally, solve for .

$x=5\text{ and }x=12$

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Example Question #11 : Factoring And Finding Roots

Which of the following polynomials has $x^{2} - 1$ as a factor?

Possible Answers:

None of these

$x^{4} - 13x ^{3} + 7x ^{2}+ 14x - 9$

$x^{4} -11x ^{3} + 6x^{2} + 11x - 7$

$x^{4} + 5x^{2} - 6x - 7x + 5$

$x^{2} +13x +15 x ^{2}+ 17 +14$

Correct answer:

$x^{4} -11x ^{3} + 6x^{2} + 11x - 7$

Explanation:

One way to work this problem is as follows:

Factor $x^{2} - 1$ using the difference of squares pattern:

$x^{2} - 1^{2} = (x+1)(x-1)$

Consequently, any polynomial divisible by $x^{2} - 1$ must be divisible by both x+1 and x - 1 .

A polynomial is divisible by x - 1 if and only if the sum of its coefficients is 0. Add the coefficients for each given polynomial:

$x^{2} +13x +15 x ^{2}+ 17 +14$

1+13+15 +17+14 = 60

$x^{4} + 5x^{2} - 6x - 7x + 5$ :

1+5 - 6 -7 +5 = -2

$x^{4} - 13x ^{3} + 7x ^{2}+ 14x - 9$ :

1 -13 +7 +14 - 9 = 0

$x^{4} -11x ^{3} + 6x^{2} + 11x - 7$ :

1 - 11 + 6 + 11 - 7 = 0

The last two polynomials are both divisible by x - 1 . The other two can be eliminated as correct choices.

A polynomial is divisible by x+1 if and only if the alternating sum of its coefficients is 0- that is, if every other coefficient is reversed in sign and the sum of the resulting numbers is 0. For each of the two uneliminated polynomials, add the coefficients, reversing the signs of the $x^{3}$ and coefficients:

$x^{4} - 13x ^{3} + 7x ^{2}+ 14x - 9$ :

1 + 13 +7 +( - 14) - 9 = -2

$x^{4} -11x ^{3} + 6x^{2} + 11x - 7$ :

1 +11 + 6 +( - 11) (- 7) = 0

The last polynomial is divisible by both x - 1 and x+1 , and, as a consequence, by $x^{2} - 1$ .

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Example Question #531 : Sat Subject Test In Math Ii

Select the polynomial that is divisible by the binomial x - 1 .

Possible Answers:

$x^{4} - 5x^{3} + 8x^{2} - 14x + 10$

None of these

$x^{4} + 8x^{3}- 9 x^{2} - 11 x + 10$

$x^{4} + 8x^{3} - 5x^{2} + 9 x -12$

$x^{4} - 8x^{3} + 13x^{2} + 3x - 8$

Correct answer:

$x^{4} - 5x^{3} + 8x^{2} - 14x + 10$

Explanation:

A polynomial is divisible by x - 1 if and only if the sum of its coefficients is 0. Add the coefficients for each given polynomial.

$x^{4} + 8x^{3} - 5x^{2} + 9 x -12$ :

1+ 8 +(- 5) + 9+ (- 12) = 1

$x^{4} + 8x^{3}- 9 x^{2} - 11 x + 10$ :

1+ 8 + (-9) + (-11)+10 = -1

$x^{4} - 8x^{3} + 13x^{2} + 3x - 8$

1 + (- 8 )+13 +3+ (- 8 )= 1

$x^{4} - 5x^{3} + 8x^{2} - 14x + 10$

1+ (- 5) + 8 +(-14) + 10 = 0

Since its coefficients add up to 0, $x^{4} - 5x^{3} + 8x^{2} - 14x + 10$ is the only one of the given polynomials divisible by x - 1 .

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SAT II Math II : Single-Variable Algebra

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

All SAT II Math II Resources

Example Questions

Example Question #9 : Factoring And Finding Roots

Example Question #81 : Single Variable Algebra

Example Question #82 : Single Variable Algebra

Example Question #83 : Single Variable Algebra

Example Question #84 : Single Variable Algebra

Example Question #531 : Sat Subject Test In Math Ii

Example Question #531 : Sat Subject Test In Math Ii

Example Question #81 : Single Variable Algebra

Example Question #11 : Factoring And Finding Roots

Example Question #531 : Sat Subject Test In Math Ii

All SAT II Math II Resources

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