Question

Evaluate the following by using suitable identity
a) 202 x 205
b) 992
(​

Answer 1

Answer:

The answer was the b 992

Answer 2

Answer:

99

2

=(100−1)

2

using (a−b)

2

=a

2

+b

2

−2ab

where a=100,b=1

=100

2

+1

2

−2×100×1

=10000+1−200=9801