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# Matrices Help!

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1. Hey, I have no clue where to even start with this question. Any help would be very appreciated!
Thanks
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2. (Original post by todd.nicholls)
Hey, I have no clue where to even start with this question. Any help would be very appreciated!
Thanks
What are the determinants of these matrices? What types of transformations are ruled out for each of them by this?

Now think about eigenvalues and eigenvectors.
3. (Original post by Gregorius)
What are the determinants of these matrices? What types of transformations are ruled out for each of them by this?

Now think about eigenvalues and eigenvectors.
I am right in thinking the determinant is 9? from the 1/9? or do I need to times it out then calculate the determinant? also how does this rule out transformations?
(I'm probably being really dim)
4. (Original post by todd.nicholls)
I am right in thinking the determinant is 9? from the 1/9? or do I need to times it out then calculate the determinant? also how does this rule out transformations?
(I'm probably being really dim)
The determinant of M is -1 and of N is 3. Feed it to Matlab or Wolfram if you're having trouble! What is the determinant of a rotation? Of a reflection? etc etc.

The eigenvalues and eigenvectors tell you exactly what these transformations are doing,

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