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JEE Mains · Maths · STD 12 - 10. vector algebra

यदि चार बिन्दु जिसके स्थिति सदिश \(3 \hat{i}-4 \hat{j}+2 \hat{k}, \hat{i}+2 \hat{j}-\hat{k},-2 \hat{i}-\hat{j}+3 \hat{k}\) तथा \(5 \hat{\mathrm{i}}-2 \alpha \hat{\mathrm{j}}+4 \hat{\mathrm{k}}\) हे, समतलीय है, तो \(\alpha\) बराबर है -

  1. A \(\frac{73}{17}\)
  2. B \(-\frac{107}{17}\)
  3. C \(-\frac{73}{17}\)
  4. D \(\frac{107}{17}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\frac{73}{17}\)

Step-by-step Solution

Detailed explanation

Let \(A:(3,-4,2)\) \(C :(-2,-1,3)\) B : \((1,2,-1) \quad\) D : \((5,-2 \alpha, 4)\) \(A, B, C, D\) are coplanar points, then \(\begin{array}{l}\Rightarrow\left|\begin{array}{ccc}1-3 & 2+4 & -1-2 \\ -2-3 & -1+4 & 3-2 \\ 5-3 & -2 \alpha+4 & 4-2\end{array}\right|=0\end{array}\)…
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