Question

Simplify

(8m² + 3m$-$6)$-$ (9m $-$ 7) + (3m²$-$ 2m + 4)

Answer 1

$$\begin{gathered} \left(8m^2+3m-6\right)-\left(9m-7\right)+\left(3m^2-2m+4\right) \\ =8m^2+3m-6-9m+7+3m^2-2m+4 \\ =8m^2+3m^2+3m-9m-2m-6+7+4 \\ =11m^2-8m+5 \end{gathered}$$