1. **State the problem:** We need to find a polynomial function $m(x)$ of degree 4 with zeros at $0$, $5$, and $3 - 2i$.
2. **Recall the important rule:** For polynomials with real coefficients, complex roots come in conjugate pairs. Since $3 - 2i$ is a root, its conjugate $3 + 2i$ must also be a root.
3. **List all roots:** $0$, $5$, $3 - 2i$, and $3 + 2i$.
4. **Write the factors:** Each root corresponds to a factor:
$$x, (x - 5), (x - (3 - 2i)), (x - (3 + 2i))$$
5. **Multiply the complex conjugate factors:**
$$ (x - (3 - 2i))(x - (3 + 2i)) = (x - 3 + 2i)(x - 3 - 2i) $$
Use the difference of squares formula:
$$ = ((x - 3))^2 - (2i)^2 = (x - 3)^2 - (-4) = (x - 3)^2 + 4 $$
6. **Expand $(x - 3)^2 + 4$:**
$$ (x - 3)^2 + 4 = (x^2 - 6x + 9) + 4 = x^2 - 6x + 13 $$
7. **Write the polynomial as product of factors:**
$$ m(x) = x (x - 5) (x^2 - 6x + 13) $$
8. **Expand $x (x - 5)$:**
$$ x (x - 5) = x^2 - 5x $$
9. **Multiply $(x^2 - 5x)(x^2 - 6x + 13)$:**
$$ (x^2 - 5x)(x^2 - 6x + 13) = x^2(x^2 - 6x + 13) - 5x(x^2 - 6x + 13) $$
$$ = x^4 - 6x^3 + 13x^2 - 5x^3 + 30x^2 - 65x $$
10. **Combine like terms:**
$$ x^4 - (6x^3 + 5x^3) + (13x^2 + 30x^2) - 65x = x^4 - 11x^3 + 43x^2 - 65x $$
11. **Final polynomial:**
$$ m(x) = x^4 - 11x^3 + 43x^2 - 65x $$
This is a possible polynomial function of degree 4 with the given zeros.
Polynomial Zeros 0Fd787
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