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TS EAMCET · Maths · Vector Algebra

If the vectors \(\mathbf{A B}=p \hat{\mathbf{i}}+q \hat{\mathbf{j}}+r \hat{\mathbf{k}}\), \(\mathbf{A C}=s \hat{\mathbf{i}}+3 \hat{\mathbf{j}}+4 \hat{\mathbf{k}}, \mathbf{C B}=3 \hat{\mathbf{i}}+\hat{\mathbf{j}}-2 \hat{\mathbf{k}}\) from \(\triangle A B C\), then the values of \(p, q, r\) and \(s\) such that the area of that \(\triangle A B C\) is \(5 \sqrt{6}\) are

  1. A \(p=11, q=4, r=-2, s=8\)
  2. B \(p=8, q=4, r=2, s=5\)
  3. C \(p=-5, q=4, r=2, s=-8\)
  4. D \(p=14, q=4, r=2, s=11\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(p=8, q=4, r=2, s=5\)

Step-by-step Solution

Detailed explanation

We have, \(\mathbf{A B}=p \hat{\mathbf{i}}+q \hat{\mathbf{j}}+r \hat{\mathbf{k}}\) \(\mathbf{A C}=s \hat{\mathbf{i}}+3 \hat{\mathbf{j}}+4 \hat{\mathbf{k}}\) \(\Rightarrow \quad \mathbf{C A}=-s \hat{\mathbf{i}}-3 \hat{\mathbf{j}}-4 \hat{\mathbf{k}}\) and…