The complex number \(2+i\) is a zero of the polynomial
\(P(z)=z^4-3 z^3+c z^2+d z-30\)
where \(c\) and \(d\) are real numbers.
- Explain why \(2-i\) is also a zero of the polynomial \(P(z)\). (1 marks)
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- Find the remaining zeros of the polynomial \(P(z)\). (2 marks)
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