Application of Derivatives 4 Question 64

67. Let f be a function defined on R (the set of all real numbers) such that f(x)=2010(x2009)(x2010)2 (x2011)3(x2012)4,xR. If g is a function defined on R with values in the interval (0,) such that f(x)=ln(g(x)),xR, then the number of points in R at which g has a local maximum is……

(2010)

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Solution:

  1. Let g(x)=ef(x),xR

g(x)=ef(x)f(x)

f(x) changes its sign from positive to negative in the neighbourhood of x=2009

f(x) has local maxima at x=2009.

So, the number of local maximum is one.



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