Consider the following list template. Members are shown as a sample. The list x contains any number triplets as shown.

x = [[1, 2, 3], [4, 5, 6], [7, 8, 9], [.., .., ..]]

a: Write Python code to extract the last column of the matrix (i.e., if the list was x = [[1, 2, 3], [4, 5, 6], [7, 8, 9]], you would get [3, 6, 9]).

b: Write another Python code to create a vector of twice the square of the middle column (i.e., if the list was x = [[1, 2, 3], [4, 5, 6], [7, 8, 9]], you would get [8, 50, 128]).