Question 1188732
can graph, try factoring, or try synthetic division, using -1,1,-3-3 as possible divisors. It does not factor, and the divisors fail to give factors.
x=-1.827, 0.297, 5.530
{{{graph(300,300,-5,10,-10,10,x^3-4x^2-9x+3)}}}
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2x^3-x-4
x=1.392
{{{graph(300,300,-3,3,-5,5,2x^3-x-4)}}}