Question

Add : $ab-4a,4b-ab,4a-4b$

Answer 1

To add : $ab-4a,4b-ab,4a-4b$

Simplify given expression

On combining the like terms and adding them we get

$\begin{array}{rcl}& =& ab–4a+(4b–ab)+(4a–4b)\\ & =& ab–4a+4b–ab+4a–4b\\ & =& ab–ab–4a+4a+4b–4b\\ & =& ab(1-1)+a(4–4)+b(4–4)\\ & =& ab\left(0\right)+a\left(0\right)+b\left(0\right)\\ & =& 0\end{array}$

Hence, required answer is $0$.