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x^2 + x - 12

1 answer

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 \((x + 4)(x - 3)\).