SOLUTION: what is the equation of the quadratic function with roots -2 and 4 and a vertex at (1,9)?

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Question 816792: what is the equation of the quadratic function with roots -2 and 4 and a vertex at (1,9)?
Answer by LinnW(1048) About Me  (Show Source):
You can put this solution on YOUR website!
You could use
http://www.wolframalpha.com/input/?i=fit+quadratic+{{-2%2C0}%2C{1%2C9}%2C{4%2C0}}
Input is
fit quadratic {{-2,0},{1,9},{4,0}}
Answer is -x%5E2%2B2x%2B8