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Question

If a to the power of 4 end exponent blank. b to the power of 5 end exponent equals 1 comma then the value of log subscript a end subscript invisible function application open parentheses a to the power of 5 end exponent b to the power of 4 end exponent close parentheses equals

  1. 9 divided by 5  
  2. 4  
  3. 5  
  4. 8 divided by 5  

The correct answer is: 9 divided by 5


    Given 4 log subscript a end subscript invisible function application a plus 5 log subscript a end subscript invisible function application b equals 0 rightwards double arrow log subscript a end subscript invisible function application b equals negative 4 divided by 5 blank open parentheses i close parentheses
    Now log subscript a end subscript invisible function application open parentheses a to the power of 5 end exponent b to the power of 4 end exponent close parentheses equals 5 plus 4 log subscript a end subscript invisible function application b equals 5 plus 4 open parentheses negative fraction numerator 4 over denominator 5 end fraction close parentheses equals 5 minus fraction numerator 16 over denominator 5 end fraction equals fraction numerator 9 over denominator 5 end fraction

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