What’s the answer to x2-4x=5 if you factor it?

1 Answer
rea · Stefan V.
Mar 12, 2018

#(x-5)(x+1)#

Explanation:

Subtract #5# from both sides. You then have:

#x^2-4x-5 = 0#

Then, what two numbers can you multiply to get #-5# and add to get #-4#? The answer is #-5# and #1#. So, make them into factors.

Your answer is then

#(x-5)(x+1)#

FOIL it and you get to what you originally had.

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