Question #efd74

1 Answer
Sep 22, 2017

(4,11)

Explanation:

For a quadratic of the form ax^2+bx+c, the vertex is (-b/(2a),(4ac-b^2)/(4a)) (Vertex Formula)

a = -2, b = 16, c=-21...
(-16/(2(-2)),(4(-2)(-21)-(16)^2)/(4(-2)))=(16/4, (168-256)/-8)=(4, 88/8)=(4,11)

The vertex is (4,11).