S'il vous plaît !! (1-b)X4 z(z+5) 2c(c-1)

(1-b)*4 = 4*1-4*b = 4-4b
z(z+5) = z*z + z*5 = z² + 5z
2c(c-1) = 2c*c - 2c*1 = 2c² - 2c

(1-b) x 4
= 4 x 1 -4 x b
= 4 -4b

z (z+5)
= z x z +z x 5
= z² +5z

2c (c-1)
= 2c x c -2c x 1
= 2c² -2c