SOLUTION: Factor out the greatest common factor of 5a(a + 3b) + 4(a + 3b)

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Question 379730: Factor out the greatest common factor of 5a(a + 3b) + 4(a + 3b)
Answer by fractalier(6550) About Me  (Show Source):
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Well, from
5a(a + 3b) + 4(a + 3b), we can factor out the (a+3b) and get
(a + 3b)(5a + 4)