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JEE Mains · Maths · STD 11- 2. Relation and Function

જો વિધેય \(\log _5\left(18 x-x^2-77\right)\) નો પ્રદેશ \((\alpha, \beta)\) હોય અને વિધેય \(\log _{(x-1)}\left(\frac{2 x^2+3 x-2}{x^2-3 x-4}\right)\) નો પ્રદેશ \((\gamma, \delta)\) હોય, તો \(\alpha^2+\beta^2+\gamma^2\) = __________

  1. A 195
  2. B 179
  3. C 186
  4. D 174
Verified Solution

Answer & Solution

Correct Answer

(C) 186

Step-by-step Solution

Detailed explanation

\begin{aligned} & f_1(x)=\log _5\left(18 x-x^2-77\right) \\ & \therefore 18 x-x^2-77>0 \\ & \quad x^2-18 x+77 < 0 \\ & x \in(7,11) \\ & \alpha=7, \beta=11 \\ & f_2(x)=\log _{(x-1)}\left(\frac{2 x^2+3 x-2}{x^2-3 x-4}\right) \\ & x>1, x-1 \neq 1, \frac{2 x^2+3 x-2}{x^2-3 x-4}>0 \\…

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