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Sagot :

Bonsoir,

1) (3x+2)²-(2x+3)² = (9x+12x+4)-(4x²+12x+9) = 5x²-5

2)  5x²-5 = 10

⇒ 5(x²-1) = 10

⇒ x²-1 = 10/5 = 2

⇒ x² = 2+1 = 3

⇒ x=√3 ou x=-√3

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