Grade 11IIT JEE Entrance Exam
the set of valves x for which f(x)=x^3-6x^27x+10 is increasing in ?? how to solve this
the set of valves x for which f(x)=x^3-6x^27x+10 is increasing in ?? how to solve this
1 Answer
Arun
Dear student
these type of questions are solved by diffrentiating the function.
i.e.
f’(x) = 3x^2 – 12 x + 7
as D = b^2- 4 ac is always negative hence f’(x) will always be positive. hence function will be wlways increasing.
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