The equation is:
[tex]x^2=10[/tex]Now to solve the equation for x, we have to take the root square in bout sides of the equation:
[tex]\sqrt[]{x^2}=\sqrt[]{10}[/tex]the power of 2 is cancel with the root, a the root of 10 have one positive and one negative solution:
[tex]x=\pm\sqrt[]{10}[/tex]