Check sibling questions

  Slide15.JPG

Slide16.JPG
Slide17.JPG Slide18.JPG

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


Transcript

Ex 6.3, 3 Find the local maxima and local minima, if any, of the following functions. Find also the local maximum and the local minimum values, as the case may be: (vi) g (š‘„) = š‘„/2 + 2/š‘„ , š‘„ > 0g (š‘„) = š‘„/2 + 2/š‘„, š‘„ > 0 Finding g’(š’™) g’(š‘„)=š‘‘/š‘‘š‘„ (š‘„/2+2/š‘„) =š‘‘/š‘‘š‘„ (š‘„/2)+š‘‘/š‘‘š‘„ (2š‘„^(āˆ’1) ) =1/2āˆ’2š‘„^(āˆ’2) =1/2āˆ’2/š‘„^2 Putting g’(š’™)=šŸŽ 1/2āˆ’2/š‘„^2 =0 (š‘„^2āˆ’ 4)/(2š‘„^2 )=0 š‘„^2āˆ’4=0 Ɨ2š‘„^2 (š‘„āˆ’2)(š‘„+2)=0 So, š‘„=2 & š‘„=āˆ’2 Since š‘„>0 is given, we consider only š‘„=2 Finding g’’(š’™) g’(š‘„)=1/2āˆ’2/š‘„^2 g’’(š‘„)=š‘‘/š‘‘š‘„ (1/2āˆ’2/š‘„^2 ) = 0 – 2 . (āˆ’2) š‘„^(āˆ’2āˆ’1) = 4š‘„^(āˆ’3) = 4/š‘„^3 Putting value š‘„=2 in g’’(š‘„) g’’(š‘„)=4/(2)^3 = 4/8= 1/2 Since g’’ (x) > 0, for x = 2 g(x) is minimum at x = 2 Minimum value of g(š‘„) is g(š‘„)=š‘„/2+2/š‘„ Putting š‘„=2 g(2)= 2/2+2/2 = 1 + 1 = 2

Ask a doubt
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.