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Sagot :

VINS

bonjour

A

x

x + 3

( x + 3 )² = x² + 6 x + 9

x² + 6 x + 9 - x²

=  6 x +9  

B

x

6 x

6 x + 9

on prend  4 =  24 + 9 = 33

on prend - 5 = - 30 + 9 = - 21

Clément a raison

6 x + 9 = 54

6 x = 54 - 9

6 x  = 45

x = 45/6 = 7.5

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