Question

using a suitable identity and without multiplying directly ,find the value of (0.98×1.02)

Answer 1

0.98×1.02
(1-0.02)×(1+0.02)
using a²-b² = (a+b)(a-b)
(1)²-(0.02)² = 1-0.0004 =0.9996
hope this helps

Answer 2

Using Identity : (a+b) (a-b) = a2- b2

 (0.98) (1.02)

=  (1.00 - 0.02) (1.00 + 0.02)

=  (1.00)2 - (0.02)2

=  1 - 0.0004

=   0.9996