MathematicsUsing identities, evaluate the following expression (8.9)3.

Using identities, evaluate the following expression (8.9)3.


  1. A
    79.21
  2. B
    80.01
  3. C
    81.18
  4. D
    82.81 

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    Solution:

    Using a-b3=a2+b2-2ab
    8.92=9-0.12
            =(9)2+(0.1)2-2×9×0.1
            =(9)2+(0.1)2-2×9×0.1
            =81+0.01-1.8
           =79.21
    So, Option 1 is correct.
     
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