A+B:
-2x+5 + (-x-3) = -2x+5 -x -3 = -3x+2
A-B :
-2x+5 - (-x-3) = -2x+5 + x + 3 = -x + 8
B-A:
-x-3-(-2x+5) = -x-3+2x-5 = x-8
AxB:
(-2x+5)(-x-3)=2xpatrat + 6x -5x -15 = 2x patrat + x - 15
Apatrat:
(-2x+5)patrat = 4x patrat + 20x + 25
Bpatrat
(-x-3)patrat = xpatrat - 6x + 9
Apatrat + B patrat :
4x patrat + 20x + 25 + xpatrat - 6x + 9 = 5xpatrat + 14x + 34