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Graph the function. Plot all necessary asymptotes. For vertical asymptotes, make sure there are at least two points on each side. \( r(x)=\frac{-8}{2 x+3} \)

Ask by Campos Kelley. in the United States
Mar 19,2025

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To graph \( r(x) = \frac{-8}{2x+3} \), plot the vertical asymptote at \( x = -\frac{3}{2} \) and the horizontal asymptote at \( y = 0 \).

Solution

To graph the function \( r(x) = \frac{-8}{2x+3} \) and plot all necessary asymptotes, we need to identify the vertical asymptote(s) and the horizontal asymptote. 1. **Vertical Asymptote(s):** - The vertical asymptote(s) occur when the denominator of the function is equal to zero. - Set the denominator \(2x+3\) equal to zero and solve for \(x\): \[ 2x + 3 = 0 \] \[ 2x = -3 \] \[ x = -\frac{3}{2} \] - Therefore, the vertical asymptote is at \(x = -\frac{3}{2}\). 2. **Horizontal Asymptote:** - The horizontal asymptote is determined by the degree of the numerator and the denominator. - In this case, the degree of the numerator is 0 (constant term) and the degree of the denominator is 1 (linear term). - Since the degree of the numerator is less than the degree of the denominator, the horizontal asymptote is the x-axis, which is \(y = 0\). Now, let's plot the function and the asymptotes on a graph.

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To graph the function \( r(x) = \frac{-8}{2x+3} \), we first identify the vertical asymptote by setting the denominator equal to zero: \( 2x + 3 = 0 \), which gives us \( x = -\frac{3}{2} \). To plot points around this asymptote, you can evaluate \( r(x) \) at values such as \( x = -2 \) and \( x = -1 \), providing \( r(-2) = 4 \) and \( r(-1) = -4 \). The horizontal asymptote can be found as \( x \) approaches positive or negative infinity. Here, as \( x \) increases or decreases, \( r(x) \) approaches zero since the degree of the polynomial in the numerator is less than that in the denominator. This gives us a horizontal asymptote at \( y = 0 \). To visualize, draw dashed lines for the vertical asymptote at \( x = -\frac{3}{2} \) and the horizontal asymptote at \( y = 0 \). Then, sketch the curve approaching these lines, ensuring it reflects the values you calculated.

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