Hi I'm new to this forum! I'm in Algebra 2 and I have a midterm to take tomorrow and I really need help with this problem!

It says:

"Suppose a parabola has vertex (-8, -7) and also passes through the point (-7, -4). Write the equation of the parabola in vertex form."

and the choices are:

a. y = (x+8)^2 - 7

b. y = 3(x-8)^2 -7

c. y = 3(x+8)^2 - 7

d. y = 3(x+8)^2 +7

Also, if you could just tell me how you got the answer, that'd be great. I'm just looking over my past tests because my math teacher said that's what the midterm will test us on, and I got this problem wrong. So the answer isn't b. Could anyone explain why?

Thanks,

Brooke