solve b and c with the help of this question

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Question 1. Find the stationary points of the following functions and determine their nature if possible. (a) f(m,2) = +z+ 3+63+1 (b) f($1, 12) = me (2ritz]). (c) f(x) = x Qx+|x -b/? where the variable r ( R", Q 6 RX" is a symmetric matrix with eigenvalues strictly larger than negative one A;(Q) > -1, and be R"