Question

The value of $(98{)}^2$ is ___

Answer 1

Answer: 9604

We have, $(98{)}^2=(100-2{)}^2$
Since, $(a-b{)}^2=\left(a^2-2ab+b^2\right)$
$=(100{)}^2-2\times 100\times 2+(2{)}^2$
$=10000-400+4=9604$