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[tex] x^{2} = 392[/tex]
x = ?


Răspuns :

x^2=2^3*7^2 => x=rad(2^3*7^2)=rad((2^2*7^2)*2)=2*7*rad(2)=14*rad(2).
[tex] x^{2} =392 \\ \\ x= \sqrt{392} \\ \\ x= \sqrt{2^{3}*7^{2}} \\ \\ x=7*2 \sqrt{2} \\ \\ x=14 \sqrt{2} [/tex]