SOLUTION: What is the equation written in vertex form of a parabola with a vertex of (9, -1) that passes through (7, 7)?

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Question 1170036: What is the equation written in vertex form of a parabola with a vertex of (9, -1) that passes through (7, 7)?
Found 2 solutions by Boreal, MathTherapy:
Answer by Boreal(15235)   (Show Source): You can put this solution on YOUR website!
y=a(x-h)^2+k
=a(x-9)^2-1, change sign of x and keep sign of y
when x=7 y=7
so 7=a(-2)^2-1=4a-1
so a=2
answer is y=2(x-9)^2-1


Answer by MathTherapy(10553)   (Show Source): You can put this solution on YOUR website!

What is the equation written in vertex form of a parabola with a vertex of (9, -1) that passes through (7, 7)?
Vertex form of a parabola: 

 ---- Substituting (7, 7) for (x, y), and (9, - 1) for (h, k)



 ---- Substituting 2 for a, and (9, - 1) for (h, k) 

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