(4, -5) and that passes through (-1, 3)?

Question

anonymous · Answer

I got 1/6 = a, but I don't know how it's final answer is f(x) = 1/6(x^ - 7)

directrix · Answer

What are you finding with the two points? Slope? Equation of a line?

anonymous · Answer

equation of the parabola

anonymous · Answer

with x- intercepts

directrix · Answer

Is it possible for just two points to determine a parabola? Are these special points, maybe the vertex and some other point on the parabola. 

I don't recognize this <  f(x) = 1/6(x^ - 7)  >> as the equation of a parabola.

directrix · Answer

Do you have instructions for the problem that you could post here?

anonymous · Answer

well this is what I did

f(x) = a(x-r)(x-s)
f(-3) = a(1-4)(1+5)
-3 = a(-3)(6)
-3/18 = -18/18 a
1/6 = a

lalaly · Answer

can u post the whole question?

anonymous · Answer

Determine the equation of the parabola with x- intercepts.

lalaly · Answer

x intercepts 4 and -5?