EDGE Math 8

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Result

Multiply and then choose your answer.

1.	$(2 a + 5) (2 a + 5)$

4 a^{2} + 20 a + 25

4 a^{2} + 10 a + 25

4 a^{2} + 25

none of the choices

Answer: $4 a^{2} + 20 a + 25$

2.	$(10 q - 7) (10 q + 7)$

100 q^{2} - 70 q - 49

100 q^{2} - 49

100 q^{2} - 140 q - 49

none of the choices

Answer: $100 q^{2} - 49$

3.	${(3 a - 2 b)}^{2}$

9 a^{2} + 6 a b + 4 b^{2}

9 a^{2} - 6 a b + 4 b^{2}

9 a^{2} - 12 a b + 4 b^{2}

none of the choices

Answer: $9 a^{2} - 12 a b + 4 b^{2}$

4.	$(t + 1) (t + 1) (t + 1)$

t^{3} + 1

t^{3} + t^{2} + t + 1

t^{3} + 3 t^{2} + 3 t + 1

none of the choices

Answer: $t^{3} + 3 t^{2} + 3 t + 1$

5.	$(x y + 4 a) (x y - 4 a)$

x^{2} y^{2} - 8 a x y - 16 a^{2}

x^{2} y^{2} - 16 a^{2}

x^{2} y^{2} + 8 a x y - 16 a^{2}

none of the choices

Answer: $x^{2} y^{2} - 16 a^{2}$

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

x^{3} - 27

x^{3} + 27

x^{3} - 3 x^{2} + 3 x - 27

none of the choices

Answer: $x^{3} - 27$

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