Answers

2016-07-25T14:20:43+08:00
8 and 9 . multiply that 2 numbers and the product is 72
0
n^2 + n - 72 = 0

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

n + 9 = 0 n - 8 = 0

n = -9 n = 8

n+1 = -8 n = 9
thank you