- Exercise 2 Let x = [3 5 4 2 8 9). a) Add 20 to each element. b) Subtract 2 from each element. c) Add 3 to just the odd-index elements. d) Compute the square root of each element. e) Compute the square of each element. - Exercise 2 Let x = [3 5 4 2 8 9). a) Add 20 to each element. b) Subtract 2 from each element. c) Add 3 to just the odd-index elements. d) Compute the square root of each element. e) Compute the square of each element