Question

Subtract $\left(\mathrm{a}-\mathrm{b}\right)$ from $\left(\mathrm{a}+\mathrm{b}\right)$.

Answer 1

We have to subtract $\left(\mathrm{a}-\mathrm{b}\right)$ from $\left(\mathrm{a}+\mathrm{b}\right)$.

$$\begin{gathered} \left(\mathrm{a}+\mathrm{b}\right)-\left(\mathrm{a}-\mathrm{b}\right) \\ =\mathrm{a}+\mathrm{b}-\mathrm{a}+\mathrm{b} \\ =\mathrm{a}-\mathrm{a}+\mathrm{b}+\mathrm{b} \\ =0+2\mathrm{b} \\ =2\mathrm{b} \end{gathered}$$

Therefore the required answer is $2\mathrm{b}$.