04-05-2015
Mathematics

contestada

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)

Respuesta :

sadielynn0210 sadielynn0210

04-05-2015

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

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