Cubic Inflection 7A39F4
1. **Problem Statement:** Find the maxima, minima, and inflection points of the function $$f(x) = (x-12)^3$$.
2. **Formula and Rules:**
- To find maxima and minima, we find the first derivative $$f'(x)$$ and solve $$f'(x) = 0$$.
- To classify these points, we use the second derivative $$f''(x)$$:
- If $$f''(x) > 0$$, the point is a local minimum.
- If $$f''(x) < 0$$, the point is a local maximum.
- If $$f''(x) = 0$$, the test is inconclusive; check for inflection points.
- Inflection points occur where $$f''(x) = 0$$ and the concavity changes.
3. **First Derivative:**
$$f(x) = (x-12)^3$$
Using the power rule:
$$f'(x) = 3(x-12)^2$$
4. **Find Critical Points:**
Set $$f'(x) = 0$$:
$$3(x-12)^2 = 0$$
$$\Rightarrow (x-12)^2 = 0$$
$$\Rightarrow x = 12$$
5. **Second Derivative:**
$$f''(x) = \frac{d}{dx} [3(x-12)^2] = 6(x-12)$$
6. **Classify Critical Point:**
Evaluate $$f''(12)$$:
$$f''(12) = 6(12-12) = 0$$
Since $$f''(12) = 0$$, the second derivative test is inconclusive.
7. **Check for Inflection Point:**
Since $$f''(x) = 6(x-12)$$ changes sign at $$x=12$$ (from negative to positive or vice versa), there is an inflection point at $$x=12$$.
8. **Summary:**
- The function has no local maxima or minima.
- There is an inflection point at $$x=12$$.
**Final answer:**
- No maxima or minima.
- Inflection point at $$x=12$$.