8. How many rows and columns must a matrix A have in order to define a mapping from R4 into R5 by the rule T'(x) = Ax? For Exercises 9 and 10, find all x in Rª that are mapped into the zero vector by the transformation x→ Ax for the given matrix A. 9. A = 1 0 2-6 -4 7 1 -4 -5 3 6 -4

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