Bonsoir,
Développer
A= (3x + 2) (3x + 2) +2 (10x + 13)
A = 9x² + 6x + 6x + 4 + 20x + 26
A = 9x² + 6x + 6x + 20x + 4 + 26
A = 9x² + 32x + 30
B = (x + 5)² - (1 - 4x) (2x+3)
B = x² + 10x + 25 - (2x + 3 - 8x² - 12x)
B = x² + 10x + 25 - 2x - 3 + 8x² + 12x
B = x² + 8x² + 10x + 12x - 2x - 3 + 25
B = 9x² + 20x + 22
Factoriser :
C=9x² - 42x + 49
C = (3x - 7)²
D=9x² - 16
D = (3x - 4) (3x + 4)
E=(x-2)² - 9
E = (x - 2 - 3) (x - 2 + 3)
E = (x - 5) (x + 1).
