Final answer:
If the equation given is x = -12, then the solution is simply x = -12. However, if there is a typo and the intended equation is quadratic in form, the quadratic formula would be used to find the values of x.
Step-by-step explanation:
To solve the equation x=−12, it appears that the solution is already presented, which corresponds to choice a) x=−12. However, if this is a typo and we are instead given the equation x² + 0.0211x - 0.0211 = 0, we would use the quadratic formula to find the value of x. The quadratic formula is x = (-b ± √(b² - 4ac)) / (2a), and it is used when the equation is in the standard quadratic form ax² + bx + c = 0.
To apply the quadratic formula, the coefficients a, b, and c from our quadratic equation are identified. For our equation, we have a = 1, b = 0.0211, and c = -0.0211. Plugging these values into the quadratic formula, we can calculate the possible values for x.
It's important to note, without a clear question it's not possible to provide an exact solution, but the quadratic formula method described is the standard approach to solve any quadratic equation of the given form.
If x=−12 is indeed the equation provided, then the correct choice is straightforwardly a) x=−12.