Question

Evaluate using identity:

22.12 – 17.9​

Answer 1

Answer:

We know (a−b)  

2

=a  

2

+b  

2

−2ab

By using this identity, we have  

998  

2

=(1000−2)  

2

 

=1000  

2

+2  

2

−2×1000×2

=1000000+4−4000

=996004