Question

How to 99 square with suitable Identity class 8

Answer 1

Answer:

1. Split 99 as (100-1)
2. Square it.
3. use the following identity:  (a-b)²= a² + b² -2ab
4. Now, 100 square = 10000, 1 square = 1 and 2ab = 200.
5. Substitute them in the identity.
6. 10000 + 1 - 200 = 9801 and that is your required perfect square number of 99.....

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