Question

y=3x^2-12x-15
Express in vertex form:
3(x-h)^2+k

Answer 1

Do you know completing the square?

Answer 2

a=3, b=-12, c=-15
h=-b/(2a)
k=3(h)^2-12(h)-15

Answer 3

the formula for h is to get the x coordinate of the vertex.
then to get k, just plug that h into the original equation.

Answer 4

ok thank you!