In the expression x2 + kx + 12, k is an integer and k < 0. Which of the following is a possible value of k?
I know it uses the a.c method of factorization but don't know how to use it?
The Attempt at a Solution
Tried to solve it by using discriminant that is b^2 - 4ac = 0,i have only remembered the formula of that,so couldn't remember which equation will apply here...Please can anyone explain it thoroughly and correctly in lay-man's terms