Réponses

2014-03-22T22:17:08+01:00

Je suppose qu'il faut développer

E=(x+1²)+7x(2 - x)

E = x² + 2x +1 + 14 x - 7 x²

E = - 6 x² + 16 x + 1


F=(x+3)(2x - 1) - 3x(2x+5)

F = 2 x² - x +  6x - 3 - 6 x² - 15 x

F = - 4 x² - 10 x - 3 

2014-03-22T23:06:33+01:00
E = (x + 1²) + 7x (2 - x)
E = x² + 2x + 1 + 14 x - 7x²
E = -6x² + 16x + 1

F = (x + 3) (2x - 1) - 3x (2x + 5)
F = 2x² - x + 6x - 3 - 6x² - 15x
F = -4x² - 10x - 3