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Nutellaxox
a fost răspuns

Rezolvati ecuatia (x²-4)(9-x²)=0 , unde x ∈ Z.

Răspuns :

0000000
(x²-4)(9-x²)=0
(x+2)(x-2)(3-x)(3+x)=0
x+2=0⇒x=-2
x-2=0⇒x=2
3-x=0⇒x=3
x+3=0⇒x-3

S={+2;-2;3;-3}
(9xpatrat - 2xpatrat - 36 + 4x patrat)
(13x patrat - 2 x patrat - 36)
11x patrat=36
11x=radical 36
11x=6
x=6 supra 11

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