Prove that the four points and are coplanar.

MATHEMATICS · Subjective · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

Prove that the four points

4\hat{i} + 5\hat{j} + \hat{k}, -(\hat{j} + \hat{k}), (3\hat{i} + 9\hat{j} + 4\hat{k})

and

4(-\hat{i} + \hat{j} + \hat{k})

are coplanar.