[tex]\begin{gathered} \text{ If a complex number a+bi is a zero of a polynomial, then its conjugate (a-bi)} \\ \text{ is also a zero of the polynomial. so, since 4-5i is a zero, } \\ 4+5i\text{ must be a zero of the polynomial.} \\ \text{ In the same way, since -5+i is a zero of the polynomial, } \\ -5-i\text{ must be a zero of the polynomial too.} \end{gathered}[/tex]
