Question

NEED MATH HELP NOW. Need help find the vertex and y intercept. Please show work.

Answer 1

Vertex: ( 1 , 9 )

Y-intercept: ( 0 , 8 )

Explanation:

y = - (x+2) (x-4)

y = -x² + 2x + 8

Find the vertex.

x = -b/2a

x = -2/2(-1)

x = -2/-2

x = 1

y = -(1)² + 2(1) + 8

y = -1 + 2 + 8

y = 9

Find the y-intercept.

Put x as 0.

y = -(0)² + 2(0) + 8

y = 8