Matrices

[HugeLag]

Please see the image, I decided to just take a screenshot of the question, because there are usually asterisks in my questions once its posted thanks, to prevent confusion!. Could someone please explain this to me, I am finding it difficult to understand matrices, and this question in particular.

All explanations and help is much appreciated!!!

 

[stapel]

Please see the image, I decided to just take a screenshot of the question, because there are usually asterisks in my questions once its posted thanks, to prevent confusion!. Could someone please explain this to me, I am finding it difficult to understand matrices, and this question in particular.

There is no image. Kindly please repost. Thank you!