Réponses

2013-02-27T18:07:28+01:00
2013-02-27T18:14:09+01:00

1.E(0,5) = 0

2.a)4x² + 8x + 4 - 9 = 4x² + 8x - 5 = E(x)

  b) (2x+2-3)(2x+2+3) = (2x-1)(2x+5)

  c) E(x) = (2x-1)(2x+5)

4.

(x-9)² + 0 => x = 9  1seule racine

4x² - 4x + 1  + 1 = 9

(2x-1)² = 8

2x - 1 = 2V2 ou 2x - 1 = -2V2

x = (1 + 2V2)/2 ou x = (1 - 2V2)/2