Question 973724
Start from standard form:


{{{y=a(x+1)^2-17}}}


{{{a(x+1)^2=y+17}}}
{{{a=(y+17)/(x+1)^2}}}
The given point...
{{{a=(-13+17)/(0+1)^2}}}
{{{a=4}}}


EQUATION OF THIS PARABOLA
{{{highlight(y=4(x+1)^2-17)}}}


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