well there are 2 imaginary roots, if you are given 4 + i the conjugate is also a root 4 - i
these roots come in pairs sometimes written
x=4±i
you are told 2 roots are real, -2, 2
a degree 5 polynomial has 5 roots....
so since imaginary roots come in pairs, the 5th root has to be real...
hope that helps
