Question 86 (vii)
Using suitable identities, evaluate the following:
47×53
We have, 47×53=(50−3)(50+3) =(50)2−(3)2 [using the identity, (a−b)(a+b)=a2−b2] =2500−9 =2491
Question 86 (viii)
52×53
Question 86 (ii)
(49)2
Question 86 (iii)
(103)2