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Sagot :

Bonsoir

(2x+3)(x-3)=5

2x²-6x+3x-9=5

2x²-6x+3x-9-5=0

2x²-3x-14=0

Δ= (-3)²-4(2×(-14)=121

X1=-(-3)-√121/2×2=-2

X2=-(-3(+√121/2×2=7/2

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