Question

Use a suitable identity to get each of the following products. (d) (999)²​

Answer 1

We have (999)  

2

=(1000−1)  

2

 

=(1000)  

2

−2×(1000)×1+1  

2

[ Using (a−b)  

2

=a  

2

−2ab+b  

2

 ]

=100000−2000+1

=998001

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