Question

WILL GIVE MEDAL

Find the vertex of this parabola.
y=-2x^2-8x+7.

Answer 1

y=2x^2-8x+7
Complete the square and format as a parabola
x^2 -4 x = 1/2 y -7/2
Complete the square of the x terms by adding ( -4/2 )^2 = 4 to both sides

+ x^2 -4 x +4 = 1/2 y -7+4
(x-2)^2 = 4 (1/8) (y-6)

The focal parameter, p = 1/8
Since p > 0 then the parabola opens up.
The vertex of the parabola is (h,k):
(h,k) = (+2, +6)

Answer 2

no its -2,15

Answer 3

ok