Let f(X, Y) = gX3+;Y' +2XY -3X - Y; let 2 be a symmetric matrix and B1, B2, two real numbers. B1 X (i) Write f(X, Y) in the form f(X, Y) = B.2 (ii) Find the minimizer of f using the conjugate gradient algorithm using a starting point of XO (iii) Calculuate the minimizer analytically from 2 and B1, B2, and check it with your answer in (ii)