19) \( m^{2}+13 x-36 \)

To factor the expression \( m^{2}+13 m-36 \), we look for two numbers that multiply to \(-36\) (the constant term) and add up to \(13\) (the coefficient of \(m\)). Those numbers are \(18\) and \(-2\). So, we can rewrite the expression as \((m + 18)(m - 2)\). Now you can use this factorization in various problem-solving situations, like solving quadratic equations or optimizing certain scenarios in math! Keep practicing spotting those key numbers!