Question 609613: PLEASE help me! I need to write an equation in vertex form when I know the vertex and some points.
1.vertex (0,-1) and (1,1) (-1,1)
2.vertex (2,4) and (1,1) (3,1)
3.vertex is (-3,-3) and (2,4) (-8,4)
Thank you so much!!
Found 2 solutions by ewatrrr, solver91311:
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website!
Hi
Using the vertex form of a parabola,  where(h,k) is the vertex
1.vertex (0,-1) and (1,1) (-1,1)
y = ax^2 - 1
1 = a· 1 - 1
2 = a and y = 2x^2 -1
2.vertex (2,4) and (1,1) (3,1)
y = a(x-2)^2 +4
1 = a(3-2)^2 + 4
-3 = a and y = -3(x-2)^2 +4
3.vertex is (-3,-3) and (2,4) (-8,4)
y = a(x+3)^2 -3
4 = a(2 +3)^2 - 3
7/25 = a and y = 7/25(x+3)^2 -3
Answer by solver91311(24713)  (Show Source):
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