Question

Resolva a equacao n(n+1)/2=300

Answer 1

n^2+n/2=300
n^2+n=600
n^2+n-600=0
n^2+25n-24n-600=0
n.(n+25)-24n-600=0
n.(n+25)-24(n+25)=0
(n+25).(n-24)=0
n+25=0
n-24=0
n= -25
n -24=0
n= -25
n= 24

Resposta: n1=-25, n2= 24.