Question

Add : $3mn,-5mn,8mn,-4mn$

Answer 1

To add : $3mn,-5mn,8mn,-4mn$

Answer

On combining the like terms and adding them ,we get

$$\begin{gathered} =3mn+(-5mn)+8mn+(-4mn) \\ =3mn–5mn+8mn–4mn \\ =mn(3–5+8–4) \\ =mn(11–9) \\ =mn\left(2\right) \\ =2mn \end{gathered}$$

Hence, the addition of $3mn,-5mn,8mn,-4mn$ is $2mn$.