To subtract one expression from the other we:
[tex](2x^2-8)-(5x^2+3x-4)[/tex]
We take out the parenthesis and start to solve:
[tex]2x^2-8+5x^2-3x+4[/tex]
Notice that all the signs in the second parenthesis changed because there was a minus sign before the parenthesis. We add similar components:
[tex]7x^2-3x-4[/tex]
