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Sagot :

Bonjour,

A = 4x^2 - 9 + (2x + 3)(x - 2)

S’il faut développer :

A = 4x^2 - 9 + 2x^2 - 4x + 3x - 6
A = 6x^2 - x - 15

S’il faut factoriser :

A = (2x)^2 - 3^2 + (2x + 3)(x - 2)
A = (2x - 3)(2x + 3) + (2x + 3)(x - 2)
A = (2x + 3)(2x - 3 + x - 2)
A = (2x + 3)(3x - 5)

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