Question

Find the square of 109.

Answer 1

Finding the square of the given number

We can find the square of 109 by applying the identity (a + b)² = a² + 2ab + b²

Now, 109 can be written as 100 + 9.

On applying the identity, we get,

109² = (100 + 9)² 

= (100)² + 2(100)(9) + (9)²

= 10000 + 1800 + 81 

= 11881

Hence, using an identity, the square of 109 is 11881.

Answer 2

Square of 109 = 109²

= 109 × 109

= 11881