# Parabola

• November 25th 2008, 08:42 AM
mcinnes
Parabola
Write an equation for a parabola with vertex(-2,4) and passing through
(-1,8)

It should be simple im just not getting it
• November 25th 2008, 09:07 AM
skeeter
$y = a(x-h)^2 + k$

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

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