Réponses

2014-04-27T13:16:26+02:00
Bonjour

5x^2+20x+2
5x² +20x +2
pour x = -4
5(-4)² + 20(-4) +2
5x16 + (-80) +2
80-80 +2 = 2

2014-04-27T13:21:46+02:00
Salut :)

E = 5x^2+20x+2
E = 5x² + 20x + 2
Alors x= -4
E = 5 × (-4)² + 20 × (-4) + 2
E = 5 × 16 + (-80) + 2
E = 80 + (-80) + 2
E = 80 - 80 + 2
E = 0 + 2
E = 2