Using the polynomials q = 3x 2 + 5x - 2, r = 2 - x 2, and s = 2x + 5, perform the indicated operation. q - [r + s] 2x2 + 3x - 9 4x2 - 3x + 9 2x2 - 3x + 9 4x2 + 3x - 9

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...

Ndndndndndndndndndnd