Question

How do you find the vertex of `y= -x^2+18x-75`?

Answer 1

Find vertex of y = -x^2 + 18x - 75

Ans: Vertex (9, 6)

Explanation:

x-coordinate of vertex:
`x = (-b/(2a)) = (-18/-2) = 9`
y-coordinate of vertex:
y = y(9) = - 81 + 162 - 75 = 6.