Question

Subtract:
4p² + 5q² − 6r² + 7 from 3p² − 4q² − 5r² − 6

Answer 1

Writing the terms of the given expressions (in the same order) in the form of rows with like terms below each other and subtracting column-wise:

$$\begin{gathered} \underline{3p^2-4q^2-5r^2-6 \\ 4p^2+5q^2-6r^2+7 \\ --+-} \\ -p^2-9q^2+r^2-13 \end{gathered}$$