SOLUTION: what is the x intercepts of a parabola with a vertex of (-1,-17) and a y intercept of (0,-13?

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Question 973724: what is the x intercepts of a parabola with a vertex of (-1,-17) and a y intercept of (0,-13?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Start from standard form:

y=a%28x%2B1%29%5E2-17

a%28x%2B1%29%5E2=y%2B17
a=%28y%2B17%29%2F%28x%2B1%29%5E2
The given point...
a=%28-13%2B17%29%2F%280%2B1%29%5E2
a=4

EQUATION OF THIS PARABOLA
highlight%28y=4%28x%2B1%29%5E2-17%29

Solve for x when y is zero, and you have the x-intercepts.