Question 206225
For the given matrix A:
(1 2 3)
(2 1 -1)
(2 0 1)
a) Write the matix 4a. (Does this just mean I solve it by multiplying each number by 4?)
That's it.  4 times each element.
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 and 
b) Use matrix multiplication to find A^2 = AA.
|11 4 4|
|+2 5 4|
|+4 4 7|