EDGE Math 8

Choose your answer(s). Note that a question may have more than one answer.

1.	Which of the following is a (are) difference(s) of two squares?

a^{2} - 9

1 - b^{2}

c^{2} - 2

4 d^{2} - 9 k^{2}

u^{3} - w^{3}

v^{4} - z^{4}

64 x^{6} - 81 y^{6}

Answer: $a^{2} - 9$ , $1 - b^{2}$ , $4 d^{2} - 9 k^{2}$ , $v^{4} - z^{4}$ , $64 x^{6} - 81 y^{6}$

2.	Which of the following is a (are) sum(s) of two cubes?

a^{3} + 9

1 + b^{3}

c^{3} + 8

64 d^{3} + 27 k^{3}

u^{3} + w^{3}

v^{4} + z^{4}

x^{6} + y^{6}

Answer: $1 + b^{3}$ , $c^{3} + 8$ , $64 d^{3} + 27 k^{3}$ , $u^{3} + w^{3}$ , $x^{6} + y^{6}$

3.	Which of the following is a (are) perfect square trinomial(s)?

a^{2} + 6 a + 36

b^{2} + 12 b + 36

c^{2} - 12 c - 36

4 x^{2} + 28 x y + 49 y^{2}

Answer: $b^{2} + 12 b + 36$ , $4 x^{2} + 28 x y + 49 y^{2}$

4.	Which of the following binomials is (are) prime?

2 a + 3 b

8 a + 9 b

8 a + 10 b

a^{2} + 9

a^{2} - 9

Answer: $2 a + 3 b$ , $8 a + 9 b$ , $a^{2} + 9$

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