Then Find The Value Of ‘a’ For Which f (x) Has Local Minimum At x = 2.

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Question

  

Then find the value of ‘a’ for which (x) has local minimum at x = 2.

Solution

Correct option is

a ≤ –1    or    a ≥ 10

We have   

                            

(x) has local minima at x = 2.   

Since, f (x) = 2x – 3 for x ≥ 2 (is strictly increasing)   

  

                      

                      

                       

                    (a + 1)(a – 10) ≥ 0   

                   a ≤ –1    or    a ≥ 10.

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