How do you factor the polynomials $fg-5g+4f-20$ ?

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Answer 1 · 2016-12-16T01:21:31

$fg-5g+4f-20 = (g+4)(f-5)$

This factors by grouping:

$fg-5g+4f-20 = (fg-5g)+(4f-20)$

$color(white)(fg-5g+4f-20) = g(f-5)+4(f-5)$

$color(white)(fg-5g+4f-20) = (g+4)(f-5)$

How do you factor the polynomials fg-5g+4f-20fg-5g+4f-20?