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Sagot :

Bonsoir,

Calculer pour x = 2/7

(3x + 2)² - (3x+2)*(x+7)

= (3 * 2/7 + 2)² - (3 * 2/7 + 2) (2/7 + 7)

= (6/7 + 14/7)² - (6/7 + 14/7) (2/7 + 49/7)

= (20/7)² - (20/7) (51/7)

= 20²/7² - 400/49

= 400/49 - 400/49

= 0.

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