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Sagot :

Bonjour,

A = 9x² - 5x

   = x(9x-5)

B = 6x + 9

   = 3(2x+3)

C = x(x+5)-x(3x-2)

   = x[(x+5)-(3x-2)]

   = x(-2x+7)

D = (x+4)(x-6)+(-1+x)(x-6)

   = (x-6)[(x+4)+(-1+x)]

   = (x-6)(2x+3)

E = (3x-1)-(3x-1)²

  = (3x-1)(1)-(3x-1)(3x-1)

  = (3x-1)(1-(3x-1)]

  = (3x-1)(2-3x)

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