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Question

The maximum value of f(x)=89x26x+5 in its domain is

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Solution

f(x) will be maximum when 9x26x+5 is minimum.
Let g(x)=9x26x+5, a=9(>0)
Minimum value of g(x)
4acb24a=1803636=4

Maximum value of f(x)=84=2

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