• January 10th 2008, 10:05 PM
MathMack
Here it is.

ab+2b-4a-8

Thanks

the answer given is (a+2)(b-4) but not sure how to get it.
• January 10th 2008, 10:10 PM
janvdl
Quote:

Originally Posted by MathMack
Here it is.

ab+2b-4a-8

Thanks

the answer given is (a+2)(b-4) but not sure how to get it.

Factor out b, out of the first two terms.
Factor out -4 out of the last two terms.

$b(a + 2) - 4(a + 2)$

$= (b - 4)(a + 2)$