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JEE Mains · Maths · STD 12 - 3 and 4 . metrices and determinant

ધારો કે \(A (1, \alpha)\), \(B (\alpha, 0)\) અને \(C (0, \alpha)\) શિરોબિંદુઆવાળા ત્રિકોણનું ક્ષેત્રફળ \(4\) ચોરસ એકમ છે. જો બિંદુઆ \((\alpha,-\alpha),(-\alpha, \alpha)\) અને \(\left(\alpha^{2}, \beta\right)\) સમરેખ હોય, તો \(\beta\) =...........

  1. A \(64\)
  2. B \(-8\)
  3. C \(-64\)
  4. D \(512\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(-64\)

Step-by-step Solution

Detailed explanation

\(\frac{1}{2}\left|\begin{array}{lll}\alpha & 0 & 1 \\ 1 & \alpha & 1 \\ 0 & \alpha & 1\end{array}\right|=\pm 4\) \(\alpha=\pm 8\) Now given points \((8,-8),(-8,8),(64, \beta)\) \(OR (-8,8),(8,-8),(64, \beta)\) are collinear \(\Rightarrow\) Slope \(=-1\). \(\beta=-64\)
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