4 A = (-3x + 8) (- 4 - 5x) B=(-x-5) (9x + 2) C = (-3-2x) (5x - 6) D= (-7x+5)(-x-3)
Vous pouvez m'aidez svp
Vous pouvez m'aidez svp
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Bonjour,
A = (-3x + 8)(-4 - 5x)
A = 12x + 15x² - 32 - 40x
A = 15x² - 28x - 32
B = (-x - 5)(9x + 2)
B = -9x² - 2x - 45x - 10
B = -9x² - 47x - 10
C = (-3 - 2x)(5x - 6)
C = -15x + 18 - 10x² + 12x
C = -10x² - 3x + 18
D = (-7x + 5)(-x - 3)
D = 7x² + 21x - 5x - 15
D = 7x² + 16x - 15