Question

998square solve using identity

Answer 1

Answer:

996004

Step-by-step explanation:

998^2=(1000-2)^2{Using identity 2 (a-b)^2=a^2-2ab+b^2

=1000^2-(2*1000*2)+2^2

=1000000-4000+4

=996004 is Answer

Answer 2

Answer:

Identity used:  (a - b)² = a² + b² - 2ab

998² = 996004

Step-by-step explanation:

998² can also be written as (1000 - 2)²

Using the identity:   (a - b)² = a² + b² - 2ab

a = 1000

b = 2

So substituting the values in the identity, we get,

(1000 - 2)² = 1000² + 2² - (2 × 1000 × 2)

=> 1000000 + 4 - 4000

= 1000004 - 4000

So,

998² =  996004

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