Bonsoir,
(x+3) (2x+5)
x*2x = 2x²
x*5 = 5x
3*2x = 6x
3*5 =15
=> 2x² +5x +6x +15 = 2x² +11x +15
Bonsoir
Développer:
C = (x + 3) (2x + 5)
C = 2x² + 5x + 6x + 15
C = 2x² + 11x + 15.
