The product of two consecutive positive even integers is 168. What is their sum?

Explanation

1. 01

   Let them be $n$ and $n + 2$: $n(n + 2) = 168$.

2. 02

   $n^2 + 2n - 168 = 0$, so $(n + 14)(n - 12) = 0$.

3. 03

   $n = 12$: the integers are 12 and 14, so the sum is 26.