Question #b895e

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Answer 1 · 2017-11-16T00:18:12

#(x-5)(x+4)#

You need to numbers that add up to the second coefficent (-1) and multiply to get the final constant (-20)

The numbers 4 and -5 work.

So we can rewrite our expression:

#x^2+4x-5x-20#

This is equal to this:

#x(x+4)-5(x+4)#

Which is equal to:

#(x-5)(x+4)#