EDGE Math 8

Choose the correct factored form of each polynomial.

1.	$12 a + 24 b - 20 c$

12 (a + 2 b) - 20 c

2 (6 a + 12 b - 10 c)

4 (3 a + 6 b - 5 c)

none of the choices

Answer: $4 (3 a + 6 b - 5 c)$

2.	$4 a x + b x + 12 a + 3 b$

(4 a + b) (x + 3)

(4 a + x) (b + 3)

(4 a + 3) (x + b)

none of the choices

Answer: $(4 a + b) (x + 3)$

3.	$b^{2} - 100$

(b - 10) (b + 10)

{(b - 10)}^{2}

{(b + 10)}^{2}

none of the choices

Answer: $(b - 10) (b + 10)$

4.	$r^{3} + 8$

(r - 2) (r^{2} + 2 r + 4)

(r + 2) (r^{2} - 4 r + 4)

(r + 2) (r^{2} - 2 r + 4)

none of the choices

Answer: $(r + 2) (r^{2} - 2 r + 4)$

5.	$64 - y^{3}$

(4 + y) (16 - 4 y + y^{2})

(4 - y) (16 + 4 y + y^{2})

(4 - y) (16 - 4 y - y^{2})

none of the choices

Answer: $(4 - y) (16 + 4 y + y^{2})$

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