Show how you got solution please. Thank you!

Problem 2 (10 points). Starting from f(x) = x'Qx + bx + c, where x is an nx1 vector, Q is an nxn symmetric matrix, b is an nx1 vector, and c is a scalar, show that Vf(x) = 2Qx + b. Hint: Find partial derivatives of the quadratic form representation that uses sums: f ( x) = E E Quix;x; + [bix;+c i=1 j=1 i=1 Problem 3 (10 points). Using the gradient Vf(x) = 2Qx + b from problem 2, and assuming f(x) has the minimum, find x that minimizes f(x) as a matrix formula