So I've been out of school for quiet a few years. I've forgotten a lot of what I've learned about algebra but I've been studying trying to pick it back up. I have a test coming up for a job that I've applied for. It's not just the test though. I've struggled with math for most of my life and I'm ready to start studying every day so it can just stop being a barrier for me. I would consider myself a fairly intelligent person but something about my brain and numbers has just never mixed and I want to change that.

I have a sample question sheet for my upcoming test. If this sheet were the full test I would have it aced with the exception of one question:

Now this is clearly going to be a pretty basic question for a lot of you so don't go too hard on me. I understand how to simplify some easier equations, but something about this one is confusing me.Consider the following formula:

7=3(x+5)(x-2)

Which of the following formulas is equivalent to this one?

A. y=3x^2 + 9x - 30

B. y=x^2 + 3x - 10

C. y=3x^2 + 3x -10

D. y=3x^2 + 3x - 30

Can someone explain which one is equivalent and why? Thanks