Question

aflati pe n:
n•(n+1)+(n+1) • (n + 2) = 72


dau multe puncte​

Answer 1

n•(n+1)+(n+1)•(n+2)=72

n²+n+n²+2n+n+2=72/-2

2n²+4n=70

2n(n+2n)=70/÷2

n(n+2n)=35

n²+2n=35