$6\mathrm{.}1$ Write a MATLAB function file for each equation and find a root of each equation within the range shown, using MATLAB's fzero command as a bracketing method:

a$.f(x)=4x^3-3x^2-30=0,0x5$

$6\mathrm{.}2$ Repeat Problem $6\mathrm{.}1,$ using MATLAB's fzero command as an open method.

$6\mathrm{.}3$ Repeat Problem $6\mathrm{.}1,$ using Excel Goal Seek.