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Sagot :

Bonjour

Développer :

e=(3x+2)² -(x-2)(3x+2)

e = 9x² + 12x + 4 - (3x² + 2x - 6x - 4)

e = 9x + 12 + 4 - 3x² - 2x + 6x + 4

e = - 3x² + 9x + 6x - 2x + 12 + 4 + 4

e = - 3x² + 14x + 22.

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