Question

Evaluate the following by using Identify-III.
) (81)2 --(19) 2​

Answer 1

Answer:

option b is the correct answer

Answer 2

Answer:

using identity a^2 - b^2 = a+ b)(a - b)

81^2 - 19^2

(81 + 19 )( 81 - 19)

( 100) (62)

100 × 62

6200