EDGE Math 8

Multiply, and then click on your answer.

1.	$(a + 5 b) (a^{2} - 5 a b + 25 b^{2})$

a^{3} + 125 b^{3}

a^{3} - 125 b^{3}

{(a - 5 b)}^{3}

none of the choices

Answer: $a^{3} + 125 b^{3}$

2.	${(3 m + n)}^{3}$

27 m^{3} + 27 m^{2} n + 9 m n^{2} + n^{3}

27 m^{3} + 3 m^{2} n + 3 m n^{2} + n^{3}

27 m^{3} + 9 m^{2} n + 9 m n^{2} + n^{3}

none of the choices

Answer: $27 m^{3} + 27 m^{2} n + 9 m n^{2} + n^{3}$

3.	$(6 w + z) (6 w - z)$

36 w^{2} - 12 w z + z^{2}

36 w^{2} - 12 w z - z^{2}

36 w^{2} - z^{2}

none of the choices

Answer: $36 w^{2} - z^{2}$

4.	$(9 + 2 a b) (9 - 2 a b)$

81 - 36 a b - 4 a^{2} b^{2}

81 + 36 a b - 4 a^{2} b^{2}

81 - 4 a^{2} b^{2}

none of the choices

Answer: $81 - 4 a^{2} b^{2}$

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