4) Create a function that receives the coefficients of a third degree polynomial in the form of a row matrix: [a,b,c,d)-f(x) = ax3 + bx? + cx + d, and determines at which real point/s the derivative becomes equal to zero: (If there is no real root, it should print' real roots not available, Example: A = [1, 15, 72,4 ] B = [-6,-4]