ધારો કે (2\alpha, \alpha) એ સૌથી મોટો અંતરાલ છે જેમાં વિધેય f(t)=\frac{|t+1|}{t^{2}}, t2 નું સ્થાનિક મહત્તમ મૂલ્ય ___ છે.

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JEE Mains · Maths · STD 12 - 6. Application of derivatives

ધારો કે \( (2\alpha, \alpha) \) એ સૌથી મોટો અંતરાલ છે જેમાં વિધેય \( f(t)=\frac{|t+1|}{t^{2}}, t<0 \) ચુસ્તપણે ઘટે છે. તો વિધેય \( g(x)=2\log_{e}(x-2)+\alpha x^{2}+4x-\alpha, x>2 \) નું સ્થાનિક મહત્તમ મૂલ્ય ___ છે.

Verified Solution

Answer & Solution

Correct Answer

(C) 4

Step-by-step Solution

Detailed explanation

Drawing graph of f(t) for t < 0 \(g(x)=\log _e(x-2)-x^2+4 x+1 ; x>2\) \(g ^{\prime}( x )=\frac{2}{ x -2}-(2( x -2) ; x >2\) \(g ^{\prime}( x )=\frac{1-( x -2)^2}{( x -2)}=\frac{-( x -3)( x -1)}{( x -2)}\) as x > 2 maxima occur at x = 3 \(g(3)=2 \log _e 1-9+12+1=4\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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