Monday 13 April 2015

LOGARITHMS 10




If log3(3x + 21)=4; find x

   Solution

log3(3x + 21)=4

 (3x + 21)=34   
                      
 3x + 21=81

3x = 81 – 21

3x =  60
  
3x =  60   
3        3

x = 20


Hence x = 20

TRY THIS...............

If log2(3x - 25)=3; find x.

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