TS EAMCET · Maths · Vector Algebra
Consider the four points \(A(1,-2,-1)\), \(B(4,0,-3), C(1,2,-1)\) and \(D(2,-4,-5)\) in space. If \(\mathbf{b}=\mathbf{A B}, \mathbf{c}=\mathbf{A C}\) and \(\mathbf{d}=\mathbf{A D}\), then
- A 40
- B -40
- C 20
- D -20
Answer & Solution
Correct Answer
(D) -20
Step-by-step Solution
Detailed explanation
\(\mathbf{O A}=\hat{\mathbf{i}}-2 \hat{\mathbf{j}}-\hat{\mathbf{k}}, \mathbf{O B}=4 \hat{\mathbf{i}}+0 \hat{\mathbf{j}}-3 \hat{\mathbf{k}}\) \(\mathbf{O C}=\hat{\mathbf{i}}+\hat{\mathbf{j}}-\hat{\mathbf{k}}, \mathbf{O D}=\hat{\mathbf{i}}-4 \hat{\mathbf{j}}-5 \hat{\mathbf{k}}\)…
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