What is the largest value of $n$ for which $x_n>x_{n+1}$?

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The sequence \(x_n\) is given by the formula \[x_n=n^3-9n^2+631.\]

The largest value of \(n\) for which \(x_n>x_{n+1}\) is

1. 5;

2. 7;

3. 11;

4. 17.

How else could we write \(x_n>x_{n+1}\)? Can we use this to form an inequality in \(n\)?