Answer
$x^4-7x^3+10x^2+26x-60$
Work Step by Step
Step 1. Since $3-i$ is a zero, we know $3+i$ is also a zero.
Step 2. The function of least degree with the given zeros can be written as $f(x)=(x+2)(x-3)(x-3+i)(x-3-i)=(x^2-x-6)(x^2-6x+10)=x^4-7x^3+10x^2+26x-60$
