#How do I answer question 2b (Matrices)

3 messages · Page 1 of 1 (latest)

amber elk
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The one in red is the answer key but I don't understand

  1. the and part as there is an A^2 I that will appear after multiplying in but I don't know how they remove it in the next step

as well as I dont understand
2. part b and how they can do (I-A)^-1 both sides

Thanks in advance!

2b.PNG beec78a0-11ce-4676-9f58-9a4e16dc9476.png
hot creekBOT
desert cradle
#
  1. A^2 * I can also be written as A^2, similar to how n*1 can be written as n (I is like 1 but for matrices)
  2. I don’t see why it can’t be done. As long as it is not the zero matrice (all entries are 0s) you can multiply both side with any matrice you want.