Pregunta
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Move the points so that they all lie on the graph of \( f(x)=\frac{-1}{30}(x+4)(x-3)(x+5)(x-1) \) and do not coincide.

Ask by Malone Garrett. in the United States
Mar 08,2025

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Move the points to the coordinates \((-5,0)\), \((-4,0)\), \((1,0)\), and \((3,0)\).

Solución

1. Any point on the graph of \[ f(x)=\frac{-1}{30}(x+4)(x-3)(x+5)(x-1) \] must have coordinates \[ (x,\, f(x)) = \left(x,\, \frac{-1}{30}(x+4)(x-3)(x+5)(x-1)\right). \] 2. To “move the points” so that they all lie on the graph and do not coincide, choose distinct \( x \)–values. Then, reassign each point’s coordinates using the formula for \( f(x) \). 3. A convenient choice is to use the zeros of \( f(x) \), where the output is 0. Notice that the factors give zeros when: \[ x+4=0,\quad x-3=0,\quad x+5=0,\quad x-1=0, \] so \[ x=-4,\quad x=3,\quad x=-5,\quad x=1. \] The corresponding points are: \[ (-4, 0),\quad (3, 0),\quad (-5, 0),\quad (1, 0). \] 4. These four points are distinct (they do not coincide) and lie on the graph of \( f(x) \). 5. In summary, one valid solution is to move the given points so that they are relocated to: \[ (-5,0),\quad (-4,0),\quad (1,0),\quad (3,0). \] Thus, by assigning any point \((x, f(x))\) using different \(x\)–values (for example, the four values above), all the points will lie on the graph of \[ f(x)=\frac{-1}{30}(x+4)(x-3)(x+5)(x-1) \] and none will coincide.

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Extra Insights

To solve this challenge, you’ll want to find the specific \( x \)-values of your points and evaluate \( f(x) \) at each of those points to determine the corresponding \( y \)-values. First, note the function you've shared is a degree 4 polynomial that will actually yield four real roots at the values \( x = -4, 3, -5, 1 \). To avoid coinciding points, select \( x \)-values that are not roots, such as integers like \( x = -6, -3, 0, 2, 4 \). Calculate \( f(x) \) for each chosen value, creating a unique \( y \)-coordinate for each, ensuring they all align beautifully on the graph! And remember, spread them out—don’t choose values too close to each other. Fun tip: Take advantage of the polynomial’s shape! Graph it roughly, finding the peaks and valleys, ensuring your points are nicely placed for better visibility and analysis. Happy plotting!

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