Respuesta :

You will need to add 3 to each side.

x^2-3=15

    +3   +3

x^2=12

and go from there

gmany

Answer:

C. Add 3 to both sides of the equation.

Step-by-step explanation:

[tex]x^2-3=15\qquad\text{add 3 to both sides of the equation}\\\\x^2-3+3=15+3\\\\x^2=15\to x=\pm\sqrt{15}[/tex]