If I want to simplify the following expression such that x= -1:
-9x2 - x + 1
x3 + x
How do I input the value of -1 into -9x2?
like this -9(-1)2 which simplifies to -9(1) which equals -9
or like this -9(-12) which simplifies to -9(-1) which equals positive 9
I ask this because I know that exponents only apply to the value or parenthetical expression right next to it. In the former case, (-1) times (-1) is positive 1. In the latter case, the square only applies to the 1 and not to the minus sign which is then left over after the 1 is squared. So, this yields a -1.
So, which way is right??