Question

evaluate the (9.8)sq using suitable identities

Answer 1

(9.8)²
= (10-0.2)²
= 100+0.04-2(100)(0.2)
= 100.04-40
= 60.04

Hence, your answer is $60.04$

Answer 2

9.8 x 10.2 (10-0.2) x (10+0.2) using identity (a+b)(a-b)= a^2-b^2 (10)^2 - (0.2)^2 100-0.04 =99.96 answer...