Question

(n + 7)^2. I got: 2n² + 14n + 49. Correct?

Answer 1

No, that is not correct. Not 2n^2 + 14n + 49. Correct is n^2 + 14n + 49. Hope that helps.

Answer 2

Oh ok that makes sense, so when your multiplying a letter by a number like this ^2 you keep it single with no numbers infront?

Answer 3

Yes. Think of the expansion (n + 7) x (n + 7) and then the "2" won't give you any "block".

Answer 4

ah ok, now what about this one (ab + 3)(ab - 3) ?? I'm stuck..

Answer 5

Ok, first, is "ab" one variable or is it a x b?

Answer 6

well the answers show them spaced up like ex. a^2b^2

Answer 7

Ok, then the answer is a^2 x b^2 - 9. When you have an equation in the form of (w + x)(w - x), then do w^2 - wx + xw - x^2.

Answer 8

The 2 middle terms cancel out to w^2 - x^2.

Answer 9

oh ok, that makes sense now. thank you!