Quadratic Intersection 6B3346
1. **State the problem:** We need to find the solutions to the equation $$-\frac{1}{2} x^2 - x + 8 = x + 3$$ which represent the points where the parabola and the line intersect.
2. **Rewrite the equation:** Move all terms to one side to set the equation to zero:
$$-\frac{1}{2} x^2 - x + 8 - x - 3 = 0$$
3. **Simplify the equation:** Combine like terms:
$$-\frac{1}{2} x^2 - 2x + 5 = 0$$
4. **Multiply through by -2 to clear the fraction:**
$$x^2 + 4x - 10 = 0$$
5. **Use the quadratic formula:** For an equation $$ax^2 + bx + c = 0$$, the solutions are
$$x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$$
Here, $$a=1$$, $$b=4$$, and $$c=-10$$.
6. **Calculate the discriminant:**
$$\Delta = b^2 - 4ac = 4^2 - 4 \times 1 \times (-10) = 16 + 40 = 56$$
7. **Find the roots:**
$$x = \frac{-4 \pm \sqrt{56}}{2} = \frac{-4 \pm 2\sqrt{14}}{2} = -2 \pm \sqrt{14}$$
8. **Approximate the solutions:**
$$\sqrt{14} \approx 3.74$$
So,
$$x_1 = -2 + 3.74 = 1.74$$
$$x_2 = -2 - 3.74 = -5.74$$
**Final answer:** The solutions to the equation are approximately $$x \approx 1.74$$ and $$x \approx -5.74$$, which are the x-values where the parabola and the line intersect.