Question

Solve the problem using direct multiplication method to find the square of $93$.

Answer 1

We can write ${93}^2=(100-7{)}^2$

Using $(a-b{)}^2=a(a-b)-b(a-b)$
Here $a=100,b=7$
Therefore, ${93}^2=100(100-7)-7(100-7)$
$=$ ${100}^2-700-700+7^2$
$=10000-1400+49$
$=8649$