Maths-
General
Easy

Question

The rate of change of square root of open parentheses x squared plus 16 close parentheses end root with respect to fraction numerator x over denominator x minus 1 end fraction at x equals 3 is

  1. 2
  2. 11 over 5
  3. negative 12 over 5
  4. negative 3

The correct answer is: negative 12 over 5


    Let y equals square root of x squared plus 16 end root text  and  end text z equals fraction numerator x over denominator x minus 1 end fraction
    On differentiating w.r.t., straight X, we get
    table attributes columnalign right left right left right left right left right left right left columnspacing 0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em end attributes row cell dy over dx equals 1 half open parentheses straight x squared plus 16 close parentheses to the power of negative 1 divided by 2 end exponent left parenthesis 2 straight x right parenthesis end cell row cell text  and  end text fraction numerator straight d z over denominator dx end fraction equals fraction numerator straight x minus 1 minus straight x over denominator left parenthesis straight x minus 1 right parenthesis squared end fraction equals fraction numerator negative 1 over denominator left parenthesis straight x minus 1 right parenthesis squared end fraction end cell row cell therefore fraction numerator dy over denominator straight d z end fraction equals fraction numerator dy divided by dx over denominator straight d z divided by dx end fraction equals fraction numerator negative straight x over denominator square root of straight x squared plus 16 end root end fraction times fraction numerator 1 over denominator fraction numerator 1 over denominator left parenthesis straight x minus 1 right parenthesis squared end fraction end fraction end cell row cell open parentheses fraction numerator dy over denominator straight d z end fraction close parentheses subscript straight x equals 3 end subscript equals fraction numerator negative 3 left parenthesis 2 right parenthesis squared over denominator square root of 25 end fraction equals fraction numerator negative 12 over denominator 5 end fraction end cell end table

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