Factoring polynomial help please

Here it is.

ab+2b-4a-8

Thanks

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

Quote:

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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.

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