SOLUTION: How do you find the vertext of y=(x-5)(x+1)?

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Question 830372: How do you find the vertext of y=(x-5)(x+1)?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How do you find the vertext of y=(x-5)(x+1)?
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You have zeros at x = -1 and at x = 5
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The vertex must be half-way between the two:
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Vertex occurs at (5+-1)/2 = 2
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The y-value of the vertex is f(2) = (2-5)(2+1) = -3*3 = -9
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graph%28400%2C400%2C-10%2C10%2C-10%2C10%2C%28x-5%29%28x%2B1%29%29
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Cheers,
Stan H.
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