Find two consecutive even integers such that 5 times their sum is 10 less than their product. (Enter your answers as a comma-separated list.)
Let the lower number be n. Then
5*(n + n+ 2) = n*(n + 2) - 10 10n + 10 = n^2 +2n -10
n^2 - 8n - 20 = 0
This factors as (n + 2)*(n - 10) = 0
I'll let you take it from here.