a) 6x + 12 = 6*x + 6*2 = 6(x + 2)

b) 15a - 35 = 5*3a - 5*7 = 5(3a - 7)

c) 3x² + 5x = x*3x + x*5 = x(3x + 5)

:)

bonjour

6 x + 12 = 6 * x + 6 x 2 = 6  ( x + 2 )

15 a - 35 = 5 * a  - 5 * 35 = 5 ( a - 7 )

3 x² + 5 x =  x * 3 x + x * 5  = x ( 3 x + 5 )