SOLUTION: I dont understand how to work this y=-1/3x^2-4x

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Question 538559: I dont understand how to work this
y=-1/3x^2-4x
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
I dont understand how to work this
y=-1/3x^2-4x
set y=0
-1/3x^2-4x
factor out -x
-x(x/3+4)=0
x=0
(x/3)+4=0
x/3=-4
x=-12
..
roots or zeros are 0 and -12