EDGE Math 8

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Result

Multiply and then choose your answer.

1.	$4 x y (x + 3 y)$

4 x^{2} y + 3 y

4 x^{2} y + 12 x y^{2}

4 x^{2} y + 3 x y^{2}

none of the choices

Answer: $4 x^{2} y + 12 x y^{2}$

2.	$- 5 a (a c + 2 b d)$

- 5 a^{2} c - 10 a b d

- 5 a^{2} c + 10 a b d

- 5 a^{2} c - 2 b d

none of the choices

Answer: $- 5 a^{2} c - 10 a b d$

3.	$(7 + 3 y) (7 - 3 y)$

49 - 42 y - 9 y^{2}

49 - 21 y - 9 y^{2}

49 - 9 y^{2}

none of the choices

Answer: $49 - 9 y^{2}$

4.	$(5 m + 2 n) (5 m + 2 n)$

25 m^{2} + 10 m n + 4 n^{2}

25 m^{2} + 20 m n + 2 n^{2}

25 m^{2} + 20 m n + 4 n^{2}

none of the choices

Answer: $25 m^{2} + 20 m n + 4 n^{2}$

5.	$(9 x + 2 y) (9 x - 2 y)$

81 x^{2} - 4 y^{2}

81 x^{2} - 18 x y - 4 y^{2}

81 x^{2} - 36 x y - 4 y^{2}

none of the choices

Answer: $81 x^{2} - 4 y^{2}$

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