Question

Subtract: (In horizontal and in vertical arrangement).

(2) (17mn − 10ab) − (−12ab + 8mn)

Answer 1

Horizontal arrangement:
(17mn − 10ab) − (−12ab + 8mn)
= 17mn − 10ab + 12ab − 8mn

Combining the like terms, we get:
17mn − 8mn − 10ab + 12ab = 9mn + 2ab

Vertical arrangement:
Writing the like terms one below the other, we get:
$\begin{array}{cccc}& 17mn& -& 10ab\\ -& (8mn& -& 12ab)\end{array}$

Now, we have:

$\begin{array}{cccc}& 17mn& -& 10ab\\ +& -8mn& +& 12ab\\ & 9mn& +& 2ab\end{array}$