I am just attempting this question and I am bit confused by how I could find it. Could you help please?
transformation A is represented by
A= \begin{bmatrix} -1 & x & 2\\\ 7-x & -6 & 1\\\ 5 & -5x & 2x \end{bmatrix}
The tetrahedron H has vertices at O,P, Q, R.
O', P', Q', R' are the images of O, P, Q, R under transformation A.
Find the values of x for which O', P', Q', R' are coplanar