Question

Which of the quadratic functions is written in vertex form?

y=(x+1)(x-5)
y=2x^2+3x-5
y-4=3(x-5)
y-7=-2(x+3)^2

Answer 1

y-7=-2(x+3)^2

Explanation:

Vertex Form

y = a(x-h)^2 + k

move the 7 by adding it to both sides in order to get it into vertex form.