Question 367626
{{{graph(300,300,-5,5,-5,5,0,x^3-4x^2+4)}}}
.
.
.
I used Newton's method in an EXCEL spreadsheet to find the roots with starting values of {{{t=1}}},{{{t=4}}}, and {{{t=-1}}} to get 
{{{f=t^3-4t^2+4}}}
{{{df/dt=3t^2-8t}}}
.
.
.
{{{t=1.193937}}}
{{{t=3.709275}}}
{{{t=-0.90321}}}