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Suppose a polynomial function of degree 4 with rational coefficients has the following given numbers as zeros:

[tex]\[ i, 4-\sqrt{5} \][/tex]

Find the other zero(s).

The other zero(s) is/are [tex]\(\square\)[/tex]
(Type an exact answer, using radicals and [tex]\( i \)[/tex] as needed. Use a comma to separate answers as needed.)


Sagot :

Given the polynomial function with rational coefficients and the zeros [tex]\(i\)[/tex] and [tex]\(4 - \sqrt{5}\)[/tex], we need to find the other zeros.

First, recall that for a polynomial with rational coefficients, complex zeros and irrational zeros must occur in conjugate pairs. This implies that if one zero is [tex]\(i\)[/tex] or [tex]\(a + b\sqrt{c}\)[/tex], then the corresponding zero must be [tex]\(-i\)[/tex] or [tex]\(a - b\sqrt{c}\)[/tex], respectively.

With this in mind, here are the given and implied zeros:
- Given zero: [tex]\(i\)[/tex]
- Its conjugate: [tex]\(-i\)[/tex]
- Given zero: [tex]\(4 - \sqrt{5}\)[/tex]
- Its conjugate: [tex]\(4 + \sqrt{5}\)[/tex]

Therefore, the complete list of zeros for the polynomial is:
[tex]$i, -i, 4-\sqrt{5}, 4+\sqrt{5}$[/tex]

The other zeros are:
[tex]$-i, 4 + \sqrt{5}$[/tex]