Tuesday 11 February 2014

LOGARITHMS B23

Evaluate the following giving your answer in standard form.

228.7 x 10-20
   5 x 10-50

Solution

228.7 x 10-20
       5 x 10-50

228.7  x   10-20
       5         10-50

=  45.74 x 10-20 –(-50)

=  45.74 x 10-20+50    

=  45.74 x 1030      then we change 45.74 into standard form as well

= 4.574 x 101 x 1030   when we have exponents with same base, we add the
                                   Powers.

  
= 4.574 x 101+30

= 4.574 x 1031

Hence   228.7 x 10-20   = 4.574 x 1031
                 5 x 10-50


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