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NDA2014MathematicsLimitsActual

If f(9)=9 and f^ (9)=4 , then what is _ x 9 f(x) -3 x -3 equal to?

Options

  1. A36
  2. B9
  3. C4
  4. DNone of the above

Correct answer

C. 4

Step-by-step solution

aligned & 4= _ x 9 f(x)-9 x-9 & 4= _ x 9 [ f(x) -3 x -3 _ x 9 [ f(x) +3 x +3 ] . & _ x 9 f(x) -3 x -3 & _ x 9 1 f(x) f^ (x) 1 x = 4 3 1 3 =4 aligned

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