1. **State the problem:** We are given the cubic function $$y = x^3 - 3x^2 + 5x - 3$$ and we want to analyze it.
2. **Recall the function:** $$y = x^3 - 3x^2 + 5x - 3$$ is a cubic polynomial.
3. **Find the critical points:** To find extrema, compute the derivative:
$$y' = \frac{d}{dx}(x^3 - 3x^2 + 5x - 3) = 3x^2 - 6x + 5$$
4. **Solve for critical points:** Set derivative equal to zero:
$$3x^2 - 6x + 5 = 0$$
5. **Use quadratic formula:**
$$x = \frac{6 \pm \sqrt{(-6)^2 - 4 \cdot 3 \cdot 5}}{2 \cdot 3} = \frac{6 \pm \sqrt{36 - 60}}{6} = \frac{6 \pm \sqrt{-24}}{6}$$
6. Since the discriminant is negative ($$-24$$), there are no real roots for the derivative, so no real critical points.
7. **Conclusion:** The function has no real extrema (no local maxima or minima).
8. **Find y-intercept:** Set $$x=0$$:
$$y = 0 - 0 + 0 - 3 = -3$$
9. **Find x-intercepts:** Solve $$x^3 - 3x^2 + 5x - 3 = 0$$. This cubic has no easy rational roots (by Rational Root Theorem, test $$\pm1, \pm3$$):
- For $$x=1$$: $$1 - 3 + 5 - 3 = 0$$, so $$x=1$$ is a root.
10. **Factor out $$x-1$$:**
$$x^3 - 3x^2 + 5x - 3 = (x-1)(x^2 - 2x + 3)$$
11. **Solve quadratic factor:**
$$x^2 - 2x + 3 = 0$$
12. **Discriminant:**
$$\Delta = (-2)^2 - 4 \cdot 1 \cdot 3 = 4 - 12 = -8 < 0$$
No real roots here.
13. **Final roots:** Only one real root at $$x=1$$.
**Summary:**
- The function has one real root at $$x=1$$.
- The y-intercept is $$-3$$.
- No real extrema exist.
**Answer:** The function $$y = x^3 - 3x^2 + 5x - 3$$ has one real root at $$x=1$$, y-intercept at $$-3$$, and no real local maxima or minima.
Cubic Analysis 3Fca19
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