$$ \begin{aligned}
\begin{array}{r}2x^3+5x^2+\enspace x\enspace-\enspace2 \\x^{2}-2x+5 ) \overline {2x^5+\enspace x^4+\enspace x^3+21x^2+ ax+\quad b}
\end{array}
\\ \underline{2x^{5}-4x^4+10x^3}\thinspace\quad
\\5x^4-\enspace 9x^3+21x^2
\\ \underline{5x^4-10x^3+25x^2}
\\x^3-\enspace4x^2+\enspace ax
\\ \underline{x^3-\enspace 2x^2+\enspace 5x}
\\-2x^2+(a-5)x+ b\thinspace
\\ \underline{-2x^2+ 4x - 10}
\\ 0
\end{aligned} $$
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