13 Factorise les expressions suivantes a. (2x - 3)(x + 2) = 5(2x − 3) b. (5x + 1)(3x 5) c. (3x + 2)(-5x - 7) d. (5x-8)(7x - 3) (x3)(5x + 1) (3x + 2)(x + 7) (7x - 3)²
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=(2x-3)au carré [(x+2)-5]
b.(5x+1)(3x-5)-(x-3)(5x+1)
=(5x+1)au carré [(3x-5)-(x-3)]
c.(3x+2)(-5x-7)-(3x+2)(x+7)
=(3x+2)au carré [(-5x-7)-(3x+2)]
d.(5x-8)(7x-3)-(7x-3)au carré
=(7x-3)au cube[(5x-8)-1]
Voilà j’espère que ça t’a aidé :)