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\fQuestion 2 In MATLAB, using the Secant Method, calculate the root for the following function: f(x) = -15.2x3 -50x2- 40x + 30 . Initial guesses: 2 and 3 . What is the root of the function? insert answer below on quiz . Be sure to upload your supporting work to the link For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial 14px VProblem 4 (20 points) - Least-Squares Fitting with Higher-Order Polynomials In the linear least-squares regression, we are aiming at minimizing the error of the fit defined as the sum of the squares of all the residuals ry's: E(a,,a,, ",.)= Er=) [x-(x, )]' = >[x-(a taxtaxtax) 1-1 where a is the number of data points, x and w are associated with / data point, and ao, al, a2, and, as are the four unknown coefficients to be determined. Derive the four equations that could be used to solve for the four unknown coefficients ao, al, az, and, a3. Note that you need to provide step-by-step & detailed derivations. NO partial credit will be given if you simply write down the four equations