Sagot :
bonjour
C = (2b – 4)(3b – 7)
= 2bx3b + 2bx(-7) - 4x3b - 4x(-7)
= 6b² - 14b - 12b + 28
= 6b² - 26b + 28
D = (3b − 5)(−3b – 5)
= -9b² +25
Bonjour,
C = (2b – 4)(3b – 7)
6b² -14b -12b +28
= 6b² -26b +28
D = (3b − 5)(−3b – 5)
= -9b² -15b +15b +25
= -9b² +25