The inverse of the following 3x3 Matrix

Asked Feb 14 '18 at 19:02

Active Feb 14 '18 at 19:02

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I was asked to find the inverse of the following Matrix:

\begin{bmatrix}1&-4&-6\\0&1&5\\0&0&1\end{bmatrix}

I took A|I where I is the 3x3 identity Matrix, row reduced it and got the following inverse Matrix:

\begin{bmatrix}1&4&14\\0&1&-5\\0&0&1\end{bmatrix}

But apparently it's wrong. Any ideas on how to help?

asked Feb 14 '18 at 19:02

Mo Os

1

Show your work. – Mathematician 42 Feb 14 '18 at 19:04
Indeed that's not the inverse. Will you show us your computations? – José Carlos Santos Feb 14 '18 at 19:04
1

I think that it should be $-14$ instead of $14$ please check your computations – 1123581321 Feb 14 '18 at 19:04
Yes, it turned out to be -14 instead of 14. Slight error. Thanks. – Mo Os Feb 14 '18 at 19:25

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