Question

(x-7)(y-9)

Answer 1

(x-7)(y-9)
Foil it out:
xy-9x-7y+63

Do you know how to foil?

Answer 2

No

Answer 3

(a+b)(a+b) = a*b+a*b+a*b+b*b.
It's hard to follow without me commentating on what I'm doing while I do it, but do you see now?

Answer 4

So you would * it?