Please answer the questions using MATLAB. Posing the answers is just fine dont need to explain everything. Thank you!

Exercise 4: 1. Find the x-coordinate for where f(x)-(x + 2)/x2 achieves its minimum value Enter a number 2. What interval on the x-axis did you use to make you plot window? Enter a short answer. Exercise 5: 1. Let fx)-x3-7x2+2x+9. Solve the cubic equation fx)-0. Find all of its roots correctly up to 4 significant digits Select exactly one of the choices. 6.6,1.1 -0.7 6.4766, 1.4692,-0.9458 6.7053,1.3259, -0.8259 0.0010, 1.0100, 7.5902 6.5806, 1.1062, -0.6868 2. Now find all solutions to x3+2x+40 (Note that the coefficient of x2 is now 0 Select exactly one of the choices. 0.6641, -0.6640, -1.3283 1.8230, -1.8230, -1.3283 0.5898 1.7445i-1.1795 1.8230 0.66411 ,-1.3283