Question

Evaluate each of the following:
$\left(iii\right).\frac{4}{7}-\frac{-5}{-7}$

Answer 1

To find: $\frac{4}{7}-\frac{-5}{-7}$

$\therefore \frac{4}{7}-\frac{-5}{-7}=\frac{4}{7}-\frac{5}{7}$ $(\because \frac{-a}{-b}=\frac{a}{b})$

$=\frac{4-5}{7}$

$=\frac{-1}{7}$

Thus, $\frac{4}{7}-\frac{-5}{-7}=\frac{-1}{7}$