Question

Using identities,evalute = 998^2​

Answer 1

Answer:

998 = 1000 - 2

So 998^2 = (1000-2)^2

As (a-b)^2 = a^2 + b^2 - 2ab

We have 1000^2 = 2^2 - 2(2)(1000)

1000000 + 4 - 4000 = 996004

Answer 2

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998 = 1000 - 2

998 = 1000 - 2So 998^2 = (1000-2)^2

998 = 1000 - 2So 998^2 = (1000-2)^2As (a-b)^2 = a^2 + b^2 - 2ab

998 = 1000 - 2So 998^2 = (1000-2)^2As (a-b)^2 = a^2 + b^2 - 2abWe have 1000^2 = 2^2 - 2(2)(1000)

998 = 1000 - 2So 998^2 = (1000-2)^2As (a-b)^2 = a^2 + b^2 - 2abWe have 1000^2 = 2^2 - 2(2)(1000)1000000 + 4 - 4000 = 996004