Réponses

2014-04-03T20:39:31+02:00
F(x) = x(x-1) + 2x(x-3)
      = x(x-1) + x(2x- 6)
      = X(x-1+2x - 6 )
     = x(3x-7)

g(x) = (x-1)^2 + 4(x-1)(x+5)
= (x-1)((x-1)+4(x+5))
= (x-1)(x-1+4x+20)
= (x-1)(5x+19) 

h(x)= (x+5)^2 - (2x+7)^2
= (x+5+2x+7)(X+5-2x-7)
= ( 3x + 12)(-x-2)

H(0) = 3x+12 = 0 ou (-x-2) = 0
        x = -12/3       ou x = -2