Find The Maximum And Minimum Value Of                         

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Question

 

Find the maximum and minimum value of  

                      

Solution

Correct option is

 is maximum or minimum according as,  

             

              

  

Using number line rule,  

Which give g’(x) changes sing from –ve to +ve at x = –3, 1  

∴                       local minimum at x = –3, 1 

And local maximum at x = 0 [as changes from +ve to –ve] 

⇒                        g(x) is maximum at x = 0

i.e.,                      gmaximum(0) = 60

and for g(x) to be minimum,

                        

                          

Substituting these values in (i) we get,

  

  

   

                               

 

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Q3

 

Find the local maximum and local minimum of (x) = x3 + 3x in [–2, 4].

Q4

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Q7

  

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Q8

  

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Q9

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Q10

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