Let $\mathbf{M} = \begin{pmatrix} 1 & -4 \\ 1 & 2 \end{pmatrix}.$  Find constants $a$ and $b$ so that
\[\mathbf{M}^{-1} = a \mathbf{M} + b \mathbf{I}.\]Enter the ordered pair $(a,b).$
Question:
Let $\mathbf{M} = \begin{pmatrix} 1 & -4 \\ 1 & 2 \end{pmatrix}.$  Find constants $a$ and $b$ so that
\[\mathbf{M}^{-1} = a \mathbf{M} + b \mathbf{I}.\]Enter the ordered pair $(a,b).$
Answer:
Let's think step by step.

user
\left( -\frac{1}{6}, \frac{1}{2} \right)
Let $\mathbf{M} = \begin{pmatrix} 1 & -4 \\ 1 & 2 \end{pmatrix}.$  Find constants $a$ and $b$ so that
\[\mathbf{M}^{-1} = a \mathbf{M} + b \mathbf{I}.\]Enter the ordered pair $(a,b).$
train