[SOLVED] Matrix Operations

**Noxide** · February 13th 2010, 01:53 PM

I need some help with this. There's no answer in the back of the book and I computed the inverse to check my answer and I keep getting it wrong.

**HallsofIvy** · February 14th 2010, 03:19 AM

"2 times row one of $A^{-1}$ minus row two of $A^{-1}$ plus 3 times row 3 of $A^{-1}$ " is simply $\begin{bmatrix}2 & -1 & 3\end{bmatrix}A^{-1}$ . But that is the second row of A. Multiplying the second row of A by $A^{-1}$ gives the second row of the identity matrix which is $\begin{bmatrix}0 & 1 & 0\end{bmatrix}$ .

**Noxide** · February 14th 2010, 07:30 AM

ah ok got it

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