Question

Subtract:
5y⁴ − 3y³ + 2y² + y − 1 from 4y⁴ − 2y³ − 6y² − y + 5

Answer 1

Arranging the terms of the given expressions in the descending powers of $x$ and subtracting column-wise:

$$\begin{gathered} \underline{4y^4-2y^3-6y^2-y+5 \\ 5y^4-3y^3+2y^2+y-1 \\ -+--+} \\ \underline{-y^4+y^3-8y^2-2y+6} \end{gathered}$$