The following problems should be done in MATLAB. For each problem provide corresponding code. The requested information should be provided via Command Window output, typed or handwritten.

9. Determine the roots of the equation y = x 3 + 2x 2 4 .

10. Write the equation for the polynomial with 4 roots at 4, 0, 3,and 4. The following problem should be done in MATLAB. Provide a plot and corresponding code.

11. Plot the polynomial in problem 10 over the domain [-5,5]. Generate the independent variable using the polyval() MATLAB command. Verify that the function crosses the x-axis at the roots listed in problem 10.