// Prove that the four points with position vectors 4 \hat{i}+5 \hat{j – InterviewSolution

1.

// Prove that the four points with position vectors 4 \hat{i}+5 \hat{j}+\hat{k},-\hat{j}-\hat{k}, 3 \hat{i}+9 \hat{j}+4 \hat{k} \text { and }-4 \hat{i}+4 j+4 \hat{k} are coplanar.

Answer»

Let A=4i+5j+k; B=-j-k; C=3i+9j+4k and D=-4i+4j+4k

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