If vectors , and are coplanar, then find the value of…

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

Problem

If vectors

\mathbf{a} = \hat{i} + 2\hat{j} - \hat{k}

\mathbf{b} = 2\hat{i} - \hat{j} + \hat{k}

and

\mathbf{c} = \lambda\hat{i} + \hat{j} + 2\hat{k}

are coplanar, then find the value of

(\lambda - 4)