We are given the following quadratic equation
[tex]x^{2}+12x-2=0[/tex]To apply the completing the square method,
We have to add the square of half the coefficient of the x -term to both sides of the equation
[tex](\frac{12}{2})^2=(6)^2=36[/tex]Therefore, we need to add 36 to both sides of the equation
Option d is the correct answer.