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[tex]a)x^{2} =9
b) x^{2} -49=0


Răspuns :

a) [tex] x^{2} =9[/tex] =>x=3
b)[tex] x^{2} -49=0[/tex] =>[tex] x^{2} =49=\ \textgreater \ x=7[/tex]
x²=9⇒x²=3²[2=2]⇒x=3;
b. x²-49=0⇒x²=49⇒x2=7²⇒x=7;