Question

How do you combine like terms in `(2x + 3) ( 2x - 3) - ( x + 1) ^ { 2}`?

Answer 1

`3x^2-2x-10`

Explanation:

First two brackets are difference of two squares: `4x^2-9`
Second double bracket expands to `x^2+2x+1`
Subtract the second from the first to get the answer above