Question

2.
Evaluate the following by using Identity-II.


(vI)
(19.9)2​

Answer 1

19.9^2 = ( 20 - 0.1 )^2

= 20^2 + 0.1^2 - 2 × 20 × 0.1

= 400 + 0.01 - 4

= 396.01

in the above I used the identity

(a - b)^2 = a^2 + b^2 - 2ab

Answer 2

Answer:

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