Simplify 18 - 2[x + (x - 5)].
First, distribute what's inside the parenthesis, and change all the subtractions to addition of negatives.18 + -2 (x^2 + - 5x)Next distribute the -218 + -2x^2 + 10xThen I like to rearrange stuff to put it in standard form.-2x^2 + 10x + 18
