Question 86 (xx)
Using suitable identities, evaluate the following:
(339)2−(161)2
We have, (339)2−(161)2=(339+161)(339−161)=500×178 =89000 [using the identity, a2−b2=(a+b)(a−b)]
Question 86 (xiii)
(9.9)2
Question 86 (iv)
(98)2
Question 86 (vi)
(995)2
Question 86 (v)
(1005)2