Question 947961
{{{graph(300,300,-5,5,-5,5,x^4+7x^3+13x^2-3x-18)}}}
Looks like {{{x=-3}}},{{{x=-2}}}, and {{{x=1}}} are the zeros.
Verify plugging in the value,
{{{(-3)^4+7(-3)^3+13(-3)^2-3(-3)-18=81-189+117+9-18=0}}}
Verify that this is true for the remaining two values.