(2x+1)-(X-1)=
to get rid of the second set of parentheses, you have to mulptiply by -1...so the x becomes -x and the -1 becomes 1.
So, its 2x + 1 - x +1 = x + 2
to get rid of the second set of parentheses, you have to mulptiply by -1...so the x becomes -x and the -1 becomes 1.
So, its 2x + 1 - x +1 = x + 2