Maths-
General
Easy

Question

If f left parenthesis x right parenthesis has a derivative at x equals a text , then  end text lim for x not stretchy rightwards arrow a of   fraction numerator x f left parenthesis a right parenthesis minus a f left parenthesis x right parenthesis over denominator x minus a end fraction is equal to

  1. f left parenthesis a right parenthesis minus a f to the power of straight prime left parenthesis a right parenthesis
  2. a f left parenthesis a right parenthesis minus f to the power of straight prime left parenthesis a right parenthesis
  3. f left parenthesis a right parenthesis plus f to the power of straight prime left parenthesis a right parenthesis
  4. af left parenthesis straight a right parenthesis plus straight f to the power of straight prime left parenthesis straight a right parenthesis

The correct answer is: f left parenthesis a right parenthesis minus a f to the power of straight prime left parenthesis a right parenthesis


    lim for x not stretchy rightwards arrow a of   fraction numerator x f left parenthesis a right parenthesis minus a f left parenthesis x right parenthesis over denominator x minus a end fraction
    equals lim for x not stretchy rightwards arrow a of   fraction numerator x f left parenthesis a right parenthesis minus af invisible function application left parenthesis a right parenthesis minus a f left parenthesis x right parenthesis plus af invisible function application left parenthesis a right parenthesis over denominator x minus a end fraction
    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 equals lim for x not stretchy rightwards arrow a of   fraction numerator f left parenthesis a right parenthesis left parenthesis x minus a right parenthesis minus a left square bracket f left parenthesis x right parenthesis minus f left parenthesis a right parenthesis right square bracket over denominator x minus a end fraction end cell row cell equals lim for x not stretchy rightwards arrow a of   fraction numerator f left parenthesis a right parenthesis left parenthesis x minus a right parenthesis over denominator x minus a end fraction minus a lim for x not stretchy rightwards arrow a of   fraction numerator f left parenthesis x right parenthesis minus f left parenthesis a right parenthesis over denominator left parenthesis x minus a right parenthesis end fraction end cell row cell equals f left parenthesis a right parenthesis minus a f to the power of straight prime left parenthesis a right parenthesis end cell end table

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