Bonsoir

3)

A = 15x + 45

A = 15 (x + 3)

B = - 6x + 24

B = 6 (- x + 4)

F = - 9x + 9

F = 9 (- x + 1)

4) Factoriser :

A = 4x² + 3x

A = x (4x + 3)

B = 7x² - x

B = x (7x - 1)

E = 5x² - 15x

E = 5x (x - 3)

H = - 4x³ - 4x² + 8x

H = 4x (- x² - x + 2)