Question

please answer this question all parts step by step solve all parts solve​

Answer 1

Using the identity (a−b)  

2

=a  

2

+b  

2

−2ab

8.9  

2

=(9−0.1)  

2

 

=9  

2

+0.1  

2

−2×9×0.1

=81+0.01−1.8

=79.21‬