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Sagot :

Bonjour,

C= (3 - 2x)² - (1+ x)² est :

identités remarquables

(a+b) ²= a² + 2ab +b²

(a-b)² = a²-2ab +b²

(3 - 2x)² = 9 -12x +4x²

 (1+ x)²  = 1+2x+x²

9 -12x +4x² -(1+2x+x²)

= 9 -12x +4x² -1-2x-x²

= 3x² -14x +8

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