vertical axis: y = a(x+1)(x-7)
if it has a highest point, it opens downward, so a < 0
The vertex is midway between the roots, at x=3
y(3) = a(4)(-4) = -16a = 4
So, find a and rearrange the equation to standard form
Find the standard equation of a parabola that has a vertical axis and satisfies the given conditions.
x-intercepts −1 and 7
highest point has y-coordinate 4
1 answer