Question

plz answer this question. and u will get 30 pts.
Plz spot error in this equation

Answer 1

3 rd step is wrong
$\frac{(10 + 10)(10 - 10) }{10(10 - 10)} \\ = > \frac{20 \times 0}{10 \times 0} \\ = > \frac{0}{0} \\ = > 0$

Answer 2

Sry The attachment is not so clear