Question

Subtract polynomials (10r^2 - 20r) - ( r - 8)

Answer 1

Given:

$(10r^2-20r)-(r-8)$$\begin{gathered} (10r^2-20r)-(r-8)=10r^2-20r-r+8 \\ =10r^2-21r+8 \end{gathered}$