Question 256294
n (n + 1) = 72


n^2 + n - 72 = 0


(n + 9) (n - 8) = 0


n + 9 = 0 ___ n = -9


n - 8 = 0 ___ n = 8


the numbers are -9 and -8 ___ OR ___ 8 and 9