Sagot :
bonjour
A = 15 x² - 12 x
B = 6 x² - 2 x - 21 x - 7 = 6 x² - 23 x - 7
C = 18 x - 6 x² - 24 + 8 x = - 6 x² + 26 x - 24
d = 9 x² - 12 x +4
Bonjour,
Développer les expressions suivantes :
A = 3x (5x – 4)
A = 15x² - 12x
B = (2x + 7)(3x – 1)
B = 6x² - 2x + 21x - 7
B = 6x² + 19x - 7
C = (3x – 4)(6 – 2x)
C = 18x - 6x² - 24 + 8x
C = - 6x² + 26x - 24
D = (3x – 2)²
D = 9x² - 12x + 4.