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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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Apr 17, 2016
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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)
Mathematics
middle-school
Billyduc
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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
Arghtype
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Apr 24, 2016
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Arghtype
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