Critical Values
1. **Problem Statement:** Find the two critical values of the function $f(x) = 2x^3 - 18x^2 + 30x - 11$.
2. **Recall:** Critical values occur where the derivative $f'(x)$ is zero or undefined. Since $f(x)$ is a polynomial, $f'(x)$ is defined everywhere, so we only solve $f'(x) = 0$.
3. **Find the derivative:**
$$f'(x) = \frac{d}{dx}(2x^3 - 18x^2 + 30x - 11) = 6x^2 - 36x + 30$$
4. **Set the derivative equal to zero to find critical points:**
$$6x^2 - 36x + 30 = 0$$
5. **Simplify by dividing both sides by 6:**
$$x^2 - 6x + 5 = 0$$
6. **Factor the quadratic:**
$$(x - 5)(x - 1) = 0$$
7. **Solve for $x$:**
$$x = 5 \quad \text{or} \quad x = 1$$
8. **Evaluate $f(x)$ at critical points to find critical values:**
- For $x=1$:
$$f(1) = 2(1)^3 - 18(1)^2 + 30(1) - 11 = 2 - 18 + 30 - 11 = 3$$
- For $x=5$:
$$f(5) = 2(5)^3 - 18(5)^2 + 30(5) - 11 = 2(125) - 18(25) + 150 - 11 = 250 - 450 + 150 - 11 = -61$$
9. **Conclusion:** The smaller critical value is $-61$ at $x=5$, and the larger critical value is $3$ at $x=1$.
**Final answer:** Smaller critical value = $-61$, Larger critical value = $3$.