1. **State the problem:** Find the complex zeros of the polynomial function $$f(x) = x^3 - 12x^2 + 49x - 58$$ and write $$f(x)$$ in factored form.
2. **Use the Rational Root Theorem** to test possible rational roots, which are factors of 58 (constant term) over factors of 1 (leading coefficient): $$\pm1, \pm2, \pm29, \pm58$$.
3. **Test $$x=1$$:**
$$f(1) = 1 - 12 + 49 - 58 = -20 \neq 0$$
4. **Test $$x=2$$:**
$$f(2) = 8 - 48 + 98 - 58 = 0$$
So, $$x=2$$ is a root.
5. **Divide $$f(x)$$ by $$x-2$$ using synthetic division:**
$$\begin{array}{r|rrrr}
2 & 1 & -12 & 49 & -58 \\
& & 2 & -20 & 58 \\
\hline
& 1 & -10 & 29 & 0 \\
\end{array}$$
The quotient is $$x^2 - 10x + 29$$.
6. **Find zeros of the quadratic $$x^2 - 10x + 29$$ using the quadratic formula:**
$$x = \frac{10 \pm \sqrt{(-10)^2 - 4 \cdot 1 \cdot 29}}{2 \cdot 1} = \frac{10 \pm \sqrt{100 - 116}}{2} = \frac{10 \pm \sqrt{-16}}{2}$$
7. Simplify the square root of negative number:
$$\sqrt{-16} = 4i$$
8. So the complex roots are:
$$x = \frac{10 \pm 4i}{2} = 5 \pm 2i$$
9. **List all complex zeros:**
$$\boxed{2, 5 + 2i, 5 - 2i}$$
10. **Write $$f(x)$$ in factored form using the roots:**
$$f(x) = (x - 2)(x - (5 + 2i))(x - (5 - 2i))$$
11. **Multiply the complex conjugate factors:**
$$ (x - (5 + 2i))(x - (5 - 2i)) = \left(x - 5 - 2i\right)\left(x - 5 + 2i\right) = (x - 5)^2 - (2i)^2 = (x - 5)^2 + 4 $$
12. Expand:
$$ (x - 5)^2 + 4 = x^2 - 10x + 25 + 4 = x^2 - 10x + 29 $$
13. **Final factored form:**
$$\boxed{f(x) = (x - 2)(x^2 - 10x + 29)}$$
Complex Zeros 2F68Dd
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