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AP EAMCET201923 Apr 2019Morning ShiftMathematicsApplication of DerivativesActual

The interval in which the function (f(x)= (7+x) (3+x) (x>0) ) decreases is

Options

  1. A( (0, 7 3 ) )
  2. B( (0, 3 7 ) )
  3. C((0,1) )
  4. D((0, ) )

Correct answer

D. ((0, ) )

Step-by-step solution

If the given function (f(x)= (7+x) (3+x) , x > 0 ) is decreasing function then (f^ (x) 0 ). ( x (0, ) ) Hence, option (d) is correct.

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