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Factor completely. 15a² + 55a - 20 A. 5(3a² + 11a - 4) B. 5(a + 4)(3a - 1) C. (5a + 2)(3a - 10) D. (5a + 4)(3a - 5)
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3 votes
Factor completely.

15a² + 55a - 20


A. 5(3a² + 11a - 4)
B. 5(a + 4)(3a - 1)
C. (5a + 2)(3a - 10)
D. (5a + 4)(3a - 5)

User Billyduc
by
7.4k points

1 Answer

7 votes
to help explain how you get A for the answer:
work backwards
5(3a²+11a-4)
multiply everything by 5
5×3a²=15a²
5×11a=55a
5×-4=-20
15a²+55a-20
User Arghtype
by
7.2k points
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