SOLUTION: solve by factoring and using the principle of zero products y^2+4y=21

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Question 238390: solve by factoring and using the principle of zero products
y^2+4y=21
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
y%5E2%2B4y=21
y%5E2%2B4y-21=0
%28y%2B7%29%28y-3%29=0
Two solutions
y%2B7=0
y=-7
.
.
y-3=0
y=3