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Sagot :

X^2=9

X^2-9=0

Factorisons :

X^2-9

=(x-3)(x+3)

Donc:(x-3)(x+3)=0

Soit

X-3=0

X=0+3

X=3

Soit

X+3=0

X=0-3

X=-3

S=[-3 ; 3 ]

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