SOLUTION: Factor. Use factoring by grouping 4a^2-7a-28a+49

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Question 813708: Factor. Use factoring by grouping
4a^2-7a-28a+49
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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4a^2 - 7a - 28a + 49
Group
(4a^2 - 28a) - (7a - 49)
Factor
4a(a - 7) - 7(a - 7)
Factor out (a - 7)
(a - 7)(4a - 7)