Question 1086462
if 4i is a zero, so is -4i
then x^2+16 is a factor
and (x-3)^2 is a factor with multiplicity 2.
f(x)=a(x^2+16)(x-3)^2
f(2)=-60=a(20)(1)
20a=-60
a=-3
f(x)=-3(x^2+16)(x-3)^2
{{{graph(300,300,-10,10,-100,100,-3(x^2+16)(x-3)^2)}}}