Question

Evaluate the expression 2q – r – (–3), when q = 2 and r = 8?

Answer 1

$$\begin{gathered} 2\mathrm{q}-\mathrm{r}-\left(-3\right) \\ =2\mathrm{q}-\mathrm{r}+3 \\ =2\times 2-8+3\left[\mathrm{On}\mathrm{taing}\mathrm{q}=2;\mathrm{r}=8\right] \\ =4-8+3 \\ =7-8 \\ =-1 \end{gathered}$$