Question

(i) (99)2
Use (a - b)2 = 22 - 2ab + b2 to evaluate the following:
(ii) (997)
By using suitable identities, evaluate the following:
(1) (9.8)2​

Answer 1

Answer:

It's simple

Step-by-step explanation:

so

(I) 99^2

(100 - 1)^2

100^2 - 2x100x1 + 1^2

10000 - 200 + 1

9801

ii. 997^2

(1000-3)^2

1000^2 - 2x1000x3 + 3^2

1000000 - 6000 + 9

994009

iii. 9.8^2

(10-0.2)^2

10^2 - 2x0.2x10 + 0.2^2

100 - 4 + 0.04

96.04