Question

Evaluate : (૧૧)^2
Evaleate using suitable identity: 104 x 105​

Answer 1

a) 104 ×105

(100+4)×(100+5)

using identity (x+a) (x+b) = x square ( a+b ) x + ab ,

where x =100 , a =4 , b=5.

(100 ) square +(4+5)(100)+(4×5)

10000 + (9) (100) + (20)

10000+900+20

=10920