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Sagot :

(2x-3)[(2x-3)+(3x+4)]

(2x-3)(2x-3+3x+4)

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

(2x-3)²+(2x-3)(3x+4)

=(2x-3)(2x-3)+(2x-3)(3x+4) : on factorise par 2x-3

=(2x-3)[(2x-3)+(3x+4)]

=(2x-3)(2x-3+3x+4)

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

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