Question 159408
{{{n(n+1)=156}}} Start with the given equation



{{{n^2+n=156}}} Distribute



{{{n^2+n-156=0}}} Subtract 156 from both sides



*[invoke quadratic_formula 1, 1, -156, "n"]



So the first number is 12 and the second number is 13 (if you only want positive integers)



Or, the first number is -13 and the second number is -12 (if you don't mind negative numbers)