Write an equation for a parabola with vertex(-2,4) and passing through

(-1,8)

It should be simple im just not getting it

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- Nov 25th 2008, 07:42 AMmcinnesParabola
Write an equation for a parabola with vertex(-2,4) and passing through

(-1,8)

It should be simple im just not getting it - Nov 25th 2008, 08:07 AMskeeter
$\displaystyle y = a(x-h)^2 + k$

vertex is at $\displaystyle (h,k) = (-2,4)$

plug in -1 for $\displaystyle x$ and 8 for $\displaystyle y$ ... solve for "$\displaystyle a$".