hw problem help. I am stuck

Problem 6. Let x be a vector. Find the gradient and the Hessians of the following functions, showing all your work. Then find and classify the stationary (critical) points for each. (a) f(x) = x Ax+b'x+ c, where A is a symmetric and negative definite matrix, b is a vector of numbers and c is a scalar. (b) f (x) =11 x-M /1, where u is a vector of parameters