Saturday 11 January 2014

LOGARITHMS B4



If log9(2x + 1)=2; find x

   Solution

log9(2x + 1)=2

 (2x + 1)=92     
                    
 2x + 1=81

2x =81 – 1

2x = 80

2x = 80   
2        2

X = 40

Hence x = 40

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