4. (2 points) (a) Let v₁ = 0 = 3 6 0 8--8--8-8-8 3 = -5 and p= 1 Determine if p is in Col A, where A = [V1 V2 V3]. 17 5 (b) Determine if u = 5 is in Nul A. (Hint: A vector x is in Nul A if Ax = 0. This is much easier than 3 finding the entire null space which is the solution set of Ax = 0. Moral: Checking whether something is a solution is one story and finding all solutions is another.)