Tuesday, 13 January 2015

EXPONENTS 11




If  1   = (81)x  ; find x.
    3

solution

1   = (81)x
3

3 -1  = (81)x

3 -1  = (3 4)x 


3 -1  = 3 4x 

3 -1  = 3 4x 

-1 = 4x

-1 = 4x
 4    4

x = -1/4

TRY THIS…………..

If  1   = (128)x ; Find x
    2

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