Question

how does -1/2-1 become 3/2

Answer 1

$$\begin{gathered} \mathrm{HI}, \\ -\frac{1}{2}-1 \\ =-\left(\frac{1}{2}+1\right)\left[\mathrm{Taking}\mathrm{minus}\mathrm{common}\right] \\ =-\left(\frac{1+2}{2}\right) \\ =\frac{-3}{2} \end{gathered}$$