Tuesday 25 February 2014

EXPONENTS A11


simplify 5
              8-2/3

Solution

5
    8-2/3

=  5 x 1
           8-2/3

=  5 x 82/3        [Since 1/a-n = an]

=  5 x (81/3)2        [Since 81/3 = cube root of 8 = 2]

=  5 x (2)2        

=  5 x 4

= 20        
          
Hence   5        = 20

              8-2/3


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