[tex]x^2=4\Longrightarrow x=4^{2^{-1}}=4^{\frac{1}{2}}=\sqrt{4}=\boxed{2}[/tex]
So the first one is correct which implies that the third one is also correct.
But these are not the only ones.
[tex]
2x=2\Longrightarrow x=\dfrac{2}{2}=\boxed{1}
[/tex]
The last one is also correct.
Hope this helps.
r3t40
