Answer:
x=-3; x=4
Explanation:
first, you should bring 12 to the other side, so subtract both sides by 12.
it would look like this:
x^2 - x - 12 = 0
next, you want to factor it out.
it would become
(x+3)(x-4) = 0
then, you can remove the parenthesis and create two separate equations:
x+3 = 0 ; x-4 = 0
then solve for x for both equations.
x=-3; x=4
hope this helped!! lmk if you have any questions about my work.