Question 984290
You didn't specify a method to use to solve for roots.
First step is to plot it to see if there are real roots.
 *[illustration fd12.JPG].
So there is a root between {{{x=-1}}} and {{{x=0}}}.
I'll use Newton's method to find it with a starting value of {{{x=-0.5}}}
{{{f(x)=x^3+4x+3}}}
{{{df/dx=3x^2+4}}}
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*[illustration NEWT1.JPG].
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{{{x=-0.67359}}}
The other two roots are complex.