Knowing the vertex and a point for yours, solving for a will allow you to find its value. You already know that (h,k)=(-2,-11).
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website! Determine the equation of a parabola with vertex (-2,-11) and point (-4,5)show answer in vertex form.
vertex form of equation : y=mx+b, m=slope, b=y-intercept
slope ∆y/∆x=(5-(-11))/(-4-(-2))=16/-2=-8
equation: y=-8x+b
solve for b using coordinates of given point (-4,5) on the curve
b=y+8x=5+8*-4=-27
equation=y=-8x-27 Answer by MathTherapy(10552) (Show Source): You can put this solution on YOUR website!
Determine the equation of a parabola with vertex (-2,-11) and point (-4,5)show answer in vertex form.
Vertex form of a parabola: , which becomes:
5 = 4a – 11
4a = 5 + 11
4a = 16
a = , or 4
Equation in vertex form: