How do you factor $7a^2-ab+28a-4b$ ?

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Answer 1 · 2016-04-28T22:22:26

There are 4 terms, so use the grouping method to create common factors.

$(7a^2 - ab) + (28a - 4b)$ Each bracket has a common factor.
= $a(7a-b) + 4(7a - b)$ This creates a common bracket.
= $(7a-b)(a+4)$

How do you factor 7a^2-ab+28a-4b7a^2-ab+28a-4b?