SOLUTION: factor: 21-10a+a^2 help?

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Question 375773: factor:
21-10a+a^2
help?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi,

factoring

21-10a+a^2

a^2-10a + 21

factoring

(a-7)(a-3)Note:SUM of the inner product(-7a) and the outer product(-3a) = -10a