Bonjour,
P=
(3- x)(4x + 2) + (4x − 2)(3 –2x)
= 12x +6 -4x² -2x + 12x -8x² -6 +4x
= -12x² +26x
Q =
(3x – 1)(2 - x) + (4x – 3)(2 - x)
= 6x -3x² -1 +x + 8x -4x² -6 +3x
= -7x² =18x -7
R = (5 - x)(4x - 2)-(3x - 1)(x + 1)
= 20x -10 -4x²+2x -( 3x² +3x -x -1)
= 20x -10 -4x²+2x - 3x² -3x+x +1
= -7x² +22x -9
S=
(4x – 9)(x - 1) – (x + 2)(5x – 1)
= 4x² -4x -9x +9 -( 5x² -x +10x -2)
=4x² -4x -9x +9 -5x² +x -10x +2
= -x² -13x +11
