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OpenStudy (anonymous):
Factor completely: 2a2 + a − 28 (2a − 7)(a + 4) (2a + 7)(a − 4) (2a − 4)(a + 7) Prime
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OpenStudy (anonymous):
it's (a+4)(2a-7)
OpenStudy (anonymous):
well if you have choices, just do the math on the choices until you get the right one.
OpenStudy (anonymous):
A.
OpenStudy (anonymous):
The way i always try to factor these is figuring out: what b*c = 28 and b+c= 1. It's only a bit tricky because you have some coefficient in front of your a^2 term.
OpenStudy (anonymous):
the answer is (2a-7)(a+4)
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