Answer
$4y^{6}-2y^{5}-6y^{4}+5y^{3}-5y^{2}+8y-3$
Work Step by Step
$ \begin{array}{lllllll}
& 2y^{5} & & -3y^{3} & +y^{2} & -2y & +3\\
& & & & & 2y & -1\\
& & -- & -- & -- & -- & --\\
& -2y^{5} & & +3y^{3} & -y^{2} & +2y & -3\\
4y^{6} & & -6y^{4} & +2y^{3} & -4y^{2} & +6y & \\
\hline & & & & & & \\
4y^{6} & -2y^{5} & -6y^{4} & +5y^{3} & -5y^{2} & +8y & -3
\end{array} \quad \begin{array}{l}
.\\
.\\
.\\
\leftarrow-1(2y^{5}-3y^{3}+y^{2}-2y+3)\\
\leftarrow 2y(2y^{5}-3y^{3}+y^{2}-2y+3)\\
\\
\leftarrow\text{combine }
\end{array}$
$4y^{6}-2y^{5}-6y^{4}+5y^{3}-5y^{2}+8y-3$