Question
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1. (20 pts.) Graphically solve the equation and inequality below. Sketch the graph(s) that you used and round your answers to two decimal places (hundredths place). (a) \( 6 x^{2}-2 x^{3}=-x^{2}+5 x+1 \)

Ask by Bowman Hilton. in the United States
Feb 13,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The solutions to the equation \( 6x^{2} - 2x^{3} = -x^{2} + 5x + 1 \) are approximately \( x \approx -0.16 \), \( x \approx 1.32 \), and \( x \approx 2.34 \).

Solution

Solve the equation by following steps: - step0: Solve for \(x\): \(6x^{2}-2x^{3}=-x^{2}+5x+1\) - step1: Move the expression to the left side: \(6x^{2}-2x^{3}-\left(-x^{2}+5x+1\right)=0\) - step2: Subtract the terms: \(7x^{2}-2x^{3}-5x-1=0\) - step3: Calculate: \(\begin{align}&x\approx -0.161702\\&x\approx 1.321037\\&x\approx 2.340665\end{align}\) - step4: Rewrite: \(x_{1}\approx -0.161702,x_{2}\approx 1.321037,x_{3}\approx 2.340665\) To solve the equation \( 6 x^{2}-2 x^{3}=-x^{2}+5 x+1 \), we first rearrange it into standard form: \[ -2x^3 + 6x^2 + x^2 - 5x - 1 = 0 \] This simplifies to: \[ -2x^3 + 7x^2 - 5x - 1 = 0 \] Next, we can find the roots of this polynomial equation. The solutions are approximately: - \( x_1 \approx -0.16 \) - \( x_2 \approx 1.32 \) - \( x_3 \approx 2.34 \) ### Graphical Representation While I cannot provide a graph directly, you can sketch the graph of the function: \[ f(x) = -2x^3 + 7x^2 - 5x - 1 \] 1. **Plot the function**: You can use graphing software or a graphing calculator to plot \( f(x) \) over the range \( x = -2 \) to \( x = 3 \). 2. **Identify the x-intercepts**: The points where the graph intersects the x-axis correspond to the solutions we found: \( x \approx -0.16, 1.32, 2.34 \). ### Inequality If you need to solve an inequality related to this equation, please specify the inequality, and I can assist you further!

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Bonus Knowledge

To graphically solve the equation \( 6x^{2} - 2x^{3} = -x^{2} + 5x + 1 \), first rearrange it into a standard form: \( -2x^{3} + 7x^{2} - 5x - 1 = 0 \). You can graph the function \( f(x) = -2x^{3} + 7x^{2} - 5x - 1 \) and find where it intersects the x-axis. Using graphing technology or a graphing calculator, you would find the approximate points of intersection (the roots), which can be rounded to two decimal places as needed. For the inequality part, you can investigate where the graph of \( f(x) \) is greater than or less than zero. You'll look at the intervals between the roots you found for the equation and test points within each interval to establish where the original inequality holds true. Graphing the function will visually help illustrate these regions.

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