How do i find the equation of a parabola given the max and two points

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The points of the parabola are (10,0) and (42,0). The maximum is 22. If you could show me the equation and how to find it, it would be greatly appreciated.

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It has the form $y=a(x-h)^2+k$, you just need to know the vertex $(h,k)$ and the scaling constant $a$.

Hint: The max here is the $y$ coordinate of the vertex, and the $x$ coordinate of the vertex lies halfway between the two $x$-intercepts.

Use one of the points you know the parabola passes thru to find $a$.