Question

How do you find the vertex of `y= (x-3)(x+3)`?

Answer 1

Find vertex of y = (x - 3)(x + 3)

Ans: Vertex (0 -9).

Explanation:

`y = (x - 3)(x + 3) = x^2 - 9.`
x-coordinate of vertex: `x = (-b)/(2a) = 0`
y-coordinate of vertex: `y = y(0) = - 9`
Vertex (0, -9)