1. **State the problem:** Find the second derivative $f''(x)$ of the function
$$f'(x) = (-3x^2 + 9x - 3)(x^2 - x + 1) - 3$$
using the product rule.
2. **Recall the product rule:** For two functions $u(x)$ and $v(x)$,
$$\frac{d}{dx}[u(x)v(x)] = u'(x)v(x) + u(x)v'(x)$$
3. **Identify functions:** Let
$$u(x) = -3x^2 + 9x - 3$$
$$v(x) = x^2 - x + 1$$
4. **Find first derivatives:**
$$u'(x) = -6x + 9$$
$$v'(x) = 2x - 1$$
5. **Find $f'(x)$ without the constant -3:**
$$f'(x) = u(x)v(x) - 3$$
6. **Find $f''(x)$:** Differentiate $f'(x)$:
$$f''(x) = \frac{d}{dx}[u(x)v(x)] - 0 = u'(x)v(x) + u(x)v'(x)$$
7. **Substitute:**
$$f''(x) = (-6x + 9)(x^2 - x + 1) + (-3x^2 + 9x - 3)(2x - 1)$$
8. **Expand terms:**
$$(-6x + 9)(x^2 - x + 1) = -6x^3 + 6x^2 - 6x + 9x^2 - 9x + 9 = -6x^3 + 15x^2 - 15x + 9$$
$$(-3x^2 + 9x - 3)(2x - 1) = -6x^3 + 3x^2 + 18x^2 - 9x - 6x + 3 = -6x^3 + 21x^2 - 15x + 3$$
9. **Add the two expansions:**
$$f''(x) = (-6x^3 + 15x^2 - 15x + 9) + (-6x^3 + 21x^2 - 15x + 3)$$
$$= -12x^3 + 36x^2 - 30x + 12$$
**Final answer:**
$$f''(x) = -12x^3 + 36x^2 - 30x + 12$$
Second Derivative A46F96
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