= 3x - x²
= 2x² + 8x - 3x-12
= x + 6x +9
= x² - 2x + 1
= x² -4
= x (4x-5)
= (x+7) (x-6)
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21) A =x (3-x)
= 3x - x²
B = (2x-3) (x +4)
= 2x² + 8x - 3x-12
22) A=( x + 3)²
= x + 6x +9
B= (x -1) ²
= x² - 2x + 1
C = (x-2) (x+2)
= x² -4
23) A=4x² - 5x
= x (4x-5)
. B = x ( x + 7) -6 (x +7)
= (x+7) (x-6)
1) le facteur commun a chaque terme de A est : (3x-2)
2) A= (3x-2)(x+1)-4 (3x-2)
= (3x-2) ( ( x+1)-4 )
3) A= (3x-2)(x+1)-4 (3x-2)
= 3x² + 3x - 2x -1 - (12x-8)
= 3x² +3x -2x -1 -12x +8
= 3x² - x -1 -12x +8
= 3x² -13x +7