Question

Subtract 2x^2 - 8 from 5x^2 + 3x - 4.

Answer 1

To subtract one expression from the other we:

$(2x^2-8)-(5x^2+3x-4)$

We take out the parenthesis and start to solve:

$2x^2-8+5x^2-3x+4$

Notice that all the signs in the second parenthesis changed because there was a minus sign before the parenthesis. We add similar components:

$7x^2-3x-4$