Répondre :
A= (7x1/3 - 3 )²- (7x1/3 - 3) x (2x1/3+5)
A= (7/3 - 3)² - (7/3 - 3) x (2/3 + 5)
A= (7/3 - 3/1)² - ( 7/3 - 3/1) x (2/3 + 5/1)
voila a toi de finir si tu arrive pas envoie moi un message
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A = (49x²-42x+9)-(14x²+35x-6x-15)
= 49x²-42x+9+14x²-35x+6x+15
= 63x²-71x+24
Factorisation
(7x-3)(7x-3)-(2x+5)
= (7x-3)(7x-3+2x-5)
= (7x-3)(9x-8)
Pour x = 1/3
= (7/3-3)(9/3-8)
= (7/3-9/3)(9/3-24/3)
= -2/3*-15/3
= 30/3 = 10