Evaluate 213×187 using suitable identity
Evaluate
Given expression can be written as
213×187=(200+13)×(200–13)
We know that
(a+b)(a-b)=a2-b2
⇒(200+13)×(200–13)=2002–132=40000–169=39831
Hence 213×187=39831.
Evaluate (102)2 using suitable identity