Bonsoir,
P= 4x²+5x+8+6x+2x²+4
P = 4x² + 2x² + 5x + 6x + 8 + 4
P = 6x² + 11x + 12
Q= -9x²+10-7x-13+3x²+10x
Q = - 9x² + 3x² - 7x + 10x + 10 - 13
Q = - 6x² + 3x - 3
R= -4x²+5x-2x²+6-14x+8
R = - 4x²- 2x² + 5x - 14x + 6 + 8
R = - 6x² - 9x + 14
S= -3x-8-7x²-9x-7x-2
S = - 7x² - 3x - 9x - 7x - 8 - 2
S = - 7x² - 19x - 10