Question 1105809
there are four roots: 3, -13, 5+4i and 5-4i
the factors are (x-3)(x+13)(x-5-4i) and (x-5+4i);
the first two foil to x^2+10x-39
the second to x^2-10x+41
they foil to x^4-10x^3+41x^2+10x^3-100x^2+410x-39x^2+390x-1599
=x^4-98x^2+800x-1599
{{{graph(300,300,-20,10,-10000,10000,x^4-98x^2+800x-1599)}}}