Question

23) Using identity evaluate 998²​

Answer 1

Answer:

998  

2

 

=(1000−2)  

2

 

Using,

(a−b)  

2

=a  

2

−2ab+b  

2

 we get,

=(1000)  

2

−2(1000)(2)+(2)  

2

 

=1000000−4000+4

=996004

Step-by-step explanation:

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Answer 2

998^2

=(1000−2)^2

Using,

(a−b)^2=a^2−2ab+b^2 we get,

=(1000)^2−2(1000)(2)+(2)^2

=1000000−4000+4

=996004