q=3x² + 5x -2
r=2-x²
s = 2x + 5
So plug in the values of q, r, and s into your equation q - [r+s], so
3x² + 5x -2 - [2-x² + 2x + 5], do the part in the brackets first
3x² + 5x -2 - [ -x² +2x +7], make sure the minus in front of the brackets is distributed to all the components
3x² + 5x -2 + x² -2x -7, then add/sub similar variables
4x² + 3x - 9, which is your answer, the last one...
