Question

How do you write `y = x^2 - 2x -3` into vertex form?

Answer 1

x of vertex: `x = (-b/2a) = 2/2 = 1`

y of vertex:`y = (f(1) = 1 - 2 - 3 = -4`

Vertex form: `f(x) = (x - 1)^2 - 4`

Check by developing: `f(x) = x^2 - 2x + 1 - 4` . OK