Factoring Polynomials: Sum and Difference of Cubes Answers

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1
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Which monomial is a perfect cube?

A
1x3
B
3x3
C
6x3
D
9x3
2
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Which is the factorization of x3 + 8?

A
(x + 2)(x2 – 2x + 4)
B
(x – 2)(x2 + 2x + 4)
C
(x + 2)(x2 – 2x + 8)
D
(x – 2)(x2 + 2x + 8)
3

Which monomial is a perfect cube?

A
49p9q3r24
B
81p12q15r12
C
121p9q3r6
D
343p6q21r6
4

Hank’s teacher asked him to verify that the product (y−3)(y2+3y+9) is a difference of cubes. He used the distributive property to multiply the binomial times the trinomial. Before simplifying, his product was a polynomial of the form y3+3y2+ay−3y2−ay−27. What is the value of a in the polynomial?

A
3
B
9
C
18
D
27
5

Which expression is equivalent to ?

Question illustration
A
7x3y4z2
B
7x3y6z2
C
49x3y6z2
D
49x3y4z2
6

What is the factorization of 729x15 + 1000?

A
(9x5 + 10)(81x10 – 90x5 + 100)
B
(9x5 + 10)(81x5 – 90x10 + 100)
C
(9x3 + 10)(81x6 – 90x6 + 100)
D
(9x3 + 10)(81x9 – 90x3 + 100)
7

Which is a difference of cubes?

A
x6 – 27
B
x15 – 36
C
x16 – 64
D
x5 – 125
8

What is the factorization of 216x12 – 64?

A
(6x3 – 4)(36x6 + 24x3 + 16)
B
(6x3 – 4)(36x9 + 24x3 + 16)
C
(6x4 – 4)(36x8 + 24x4 + 16)
D
(6x4 – 4)(36x12 + 24x4 + 16)
9

Which statements are true about a perfect cube monomial and its roots? Check all that apply.

A
A perfect cube monomial must have exponents on the variables.
B
A perfect cube monomial must have three identical roots, such that the product of the roots equal the perfect square monomial.
C
The coefficient of the monomial must be divisible by 3.
D
Any monomial can be a perfect cube root.
E
The least common multiple of all the exponents on variables of a perfect cube monomial must be 3.
F
It must be possible for the coefficient of a perfect cube monomial to be written in the form n3, where n equals the cube root of the coefficient.
10

Which product will result in a sum or difference of cubes?

A
(x + 7)(x2 – 7x + 14)
B
(x + 8)(x2 + 8x + 64)
C
(x – 9)(x2 + 9x + 81)
D
(x – 10)(x2 – 10x + 100)

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