i have to write an equation involving an inverse matrix and solve for a, b and c.
so far i've got to
(9 -3 1) (a) (28)
(16 4 1) (b) = (-7)
(49 7 1) (c) (38)
if anyone could help me i would appreciate it a lot as I am really stuck
Hello gbookerFind the inverse of the matrix $\displaystyle \begin{pmatrix}9&-3&1\\16&4&1\\49&7&1\end{pmatrix}$, using the method shown, for instance, here.
When you multiply on the left of each side by this inverse matrix, the LHS becomes $\displaystyle \begin{pmatrix}a\\b\\c\end{pmatrix}$, and the RHS will give (when you complete the multiplication) the solutions you want.
Can you complete it now?
Grandad