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bonjour

(5x-2)(5x-8)-(3x-5)(x+7)

= 25 x² - 40 x - 10 x + 16 - ( 3 x² + 21 x - 5 x - 35)

= 25 x² - 50 x + 16 - 3 x² - 21 x + 5 x + 35

= 22 x² - 66 x +  51

EZRFRGT

Salut, voici la réponse :

(5x-2)(5x-8)-(3x-5)(x+7) = 5x*5x+5x*(-8)+(-2)*5x+(-2)*(-8) -3x*x +(-3x)*7 + 5*x + 5*7 = 25x²-40x-10x+16-3x²-21x+5x+35 = 22x²-66x+35

Bonne journée.

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