71. Test n. 3, Winter 2015. Consider the system of equations ka1 k +1 ka2 (k + 2)x2 + 8x2 + (k - 1)x3 9x3 x3 k + 1 (a) Write it in matrix form Ax = b. Compute the determinant of A and determine for which values of k the system admits a unique solution. (b) Using Cramer's rule solve the given system in case it admits a unique solution (the solution should be given in terms of k).

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