In Matlab... Below the question is what I've attempted and I keep gettin an unidentified Newton error in my original code before I can even move on to this question

l Use the Newton code you constructed in Lab2 to find all three roots one at a time in double precision, of the cubic t), F (x) X3 1.2x 8.55x 12.15 You'll probably need to plot the function to figure out good starting points. Try at least two different starting values and discuss how convergence is affected (count iterations). For efficiency and accuracy, polynomials should always be evaluated in nested form Horner's Rule like axatbxtc c (b a x) j a. Check, by and that x 3 is an exact root b. Did your solver find. -3 as an exact root c. How do you know if it's an exact root or not? d. If not, what could you do to increase the accuracy try it did it work e. What are the other 2 roots how many iterations did each take