SOLUTION: is (y+4)(y-5)= 0 is the answer y squared - 1y - 20 if not please explain.

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Question 163: is (y+4)(y-5)= 0 is the answer y squared - 1y - 20 if not please explain.
Answer by KMST(5484) About Me  (Show Source):
You can put this solution on YOUR website!
Yes. Kind of.
%28y%2B4%29%28y-5%29=y%5E2-1y-20 and %28y%2B4%29%28y-5%29=+0 is the same as y%5E2-1y-20=0
%28y%2B4%29%28y-5%29=y%28y-5%29%2B4%28y-5%29=y%5E2-5y%2B4y-20=y%5E2-y-20=y%5E2-1y-20
I would rather write it as y%5E2-y-20 , because it is the simplest way to express it,
and because multiplication times 1 is rather pointless.