1. **State the problem:** We are given the quadratic function $$c(x) = -x^2 + 11x - 24$$ and three statements about it:
- #1: The x-intercepts are (3,0) and (7,0).
- #2: The maximum value is 6.25.
- #3: The vertex is in quadrant I.
2. **Find the x-intercepts:** To find x-intercepts, solve $$c(x) = 0$$:
$$-x^2 + 11x - 24 = 0$$
Multiply both sides by $$-1$$ to simplify:
$$\cancel{-1}(-x^2 + 11x - 24) = \cancel{-1}(0)$$
$$x^2 - 11x + 24 = 0$$
Factor the quadratic:
$$(x - 3)(x - 8) = 0$$
So, $$x = 3$$ or $$x = 8$$.
Therefore, the x-intercepts are (3,0) and (8,0), not (7,0).
3. **Find the vertex:** The vertex x-coordinate is the midpoint of the roots:
$$x_v = \frac{3 + 8}{2} = \frac{11}{2} = 5.5$$
Find the y-coordinate by evaluating $$c(5.5)$$:
$$c(5.5) = -(5.5)^2 + 11(5.5) - 24 = -30.25 + 60.5 - 24 = 6.25$$
4. **Determine the quadrant of the vertex:** The vertex is at (5.5, 6.25). Since $$x > 0$$ and $$y > 0$$, the vertex lies in quadrant I.
5. **Check the maximum value:** Since the parabola opens downward (coefficient of $$x^2$$ is negative), the vertex y-value is the maximum value, which is 6.25.
**Summary:**
- Statement #1 is incorrect because the second x-intercept is (8,0), not (7,0).
- Statement #2 is correct.
- Statement #3 is correct.
**Final answer:** Only statement #1 is incorrect.
Quadratic Analysis B9244F
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