D=(a+2b) (2a-b) CALCULER D pour: 1) a=5et b=3 2)a=-3etb=4 3) a=-2etb=-3 MERCI

Bonjour,

Calculer D pour :

1) a = 5 et b = 3
D = (a + 2b) (2a - b)
D = (5 + 2 * 3) (2 * 5 - 3)
D = (5 + 6) (10 - 3)
D = (11) (7)
D = 77

2) a = - 3 et b = 4
D = (a + 2b) (2a - b)
D = ( - 3 + 2 * 4) (2 * - 3 - 4)
D = (- 3 + 8) (- 6 - 4)
D = (5) (- 10)
D = - 50

3) a = - 2 et b = - 3
D = (a + 2b) (2a - b)
D = (- 2 + 2 * - 3) (2 * - 2 - - 3)
D = (- 2 - 6) (- 4 + 3)
D = (- 8) (- 1)
D = 8