Just need (c) and (d)

For the following constrained maximization and minimization problems: (i) solve for the maximum or minimum and (ii) use the second order conditions to confirm that your answer is a true optimum. (a) max y = (x1 + 2) (x2 + 3) subject to X1 + 72 = 11. (b) max y = X1 . X2 subject to 2x1 + 3x2 = 60. (c) min y = X1 + 2x2 subject to X1 . X2 = 100. (d) min y = 4x1 + 212 subject to x2 . 12 = 90