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Sagot :

Bonjour

(3x+2)² - (3x+2)(x+7)

(3x+2)² -3x-2-x-7

(3x+2)²-4x-9

 

By Vetteliste

3x X 3x + 2 X 3x X 2 + 2 X 2 - 3x X x  + 3x X 7 + 2 X x + 2 X
= 9x² + 12x + 4 - 3x² + 21x + 2x + 14
= 3x² + 35x + 18

 

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