To factor the quadratic expression \( x^2 + x - 12 \), we need to find two numbers that multiply to \(-12\) (the constant term) and add to \(1\) (the coefficient of the linear term \(x\)).
The two numbers that meet these criteria are \(4\) and \(-3\) since:
- \(4 \times (-3) = -12\)
- \(4 + (-3) = 1\)
Thus, we can factor the expression as follows:
\[ (x + 4)(x - 3) \]
So, the factored form of \( x^2 + x - 12 \) is \((x + 4)(x - 3)\).