n(n+1)(2n+1)=840

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Solution for n(n+1)(2n+1)=840 equation: 



n(n+1)(2n+1)=840

We move all terms to the left:

n(n+1)(2n+1)-(840)=0

We multiply parentheses ..

n(+2n^2+n+2n+1)-840=0

We multiply parentheses

2n^3+n^2+2n^2+n-840=0

We do not support enpression: n^3

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