Answer
$x^{4}+x^{3}-6x^{2}-5x-1$
Work Step by Step
Multiply each term of one polynomial with the terms of the other polynomial,
and combine like terms
$ \begin{array}{ccccccccc}
x^{2}(x^{2}-2x-1) = & x^{4} & -2x^{3} & -x^{2} & & & \\
+ & & & & & & \\
3x(x^{2}-2x-1) = & & 3x^{3} & -6x^{2} & -3x & & \\
+ & & & & & & \\
1(x^{2}-2x-1)= & & & x^{2} & -2x & -1 & \\
\hline & & & & & & \\
\text{Combine} & x^{4} & +x^{3} & -6x^{2} & -5x & -1 &
\end{array} $
