The reduced row echelon form of  is equal to R =

 

(a)  What can you say about row 3 of A? Give an example of a possible third row for A.

(b)  Determine the values of a and b.

(c)  Determine the solution of the homogeneous system of equations Rx = 0 in parametric vector form.

(d)  What is the dimension of the column space of A? Do the columns of A span R3 ?

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