Question

solve this problem plzzzz​

Answer 1

n² + n / 2 = 120

n² + n = 240

n² + n - 240 = 0

n² + 16n - 15n - 240 = 0

n(n+16) - 15(n + 16)

(n+16)(n-15)

n = -16 is neglected because n can't be zero.

n = 15.

So your answer is 15