SOLUTION: What is the vertex form of the equation y=4(x+1)(x-1)?

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Question 991544: What is the vertex form of the equation y=4(x+1)(x-1)?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
y=4%28x%2B1%29%28x-1%29
Since the zeros are at x=-1 and x=1, then the vertex will be at x=0.
When x=0,y=4%281%29%28-1%29=-4.
(0,-4)
y=4%28x-0%29%5E2-4
y=4x%5E2-4
Or multiplying it out.
y=4%28x%2B1%29%28x-1%29
y=4%28x%5E2-1%29
y=4x%5E2-4
(0,-4)