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\( f(x)=\frac{x+3}{(x-1)(x+3)} \quad \) Find the vertical asymptotes and holes of the function. \( \begin{array}{l}\text { Hole: }(-3,-1 / 4) \\ \text { VA: } x=1,-3\end{array} \) \( \begin{array}{l}\text { Hole: None; } \\ \text { VA: } x=1,-3\end{array} \) Hole: \( (-3,-1 / 4) \) VA: \( x=1 \)

Ask by Potter Grant. in the United States
Feb 24,2025

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Answer

Hole at (–3, –1/4), vertical asymptote at x = 1.

Solution

The given function is   f(x) = (x + 3) ⁄ [(x – 1)(x + 3)]. Step 1. Factor and cancel common factors.   Notice that (x + 3) appears in both the numerator and the denominator.   However, we can only cancel (x + 3) if we remember that x = –3 is not allowed in the original function. After canceling, we have   f(x) = 1 ⁄ (x – 1)  for x ≠ –3. Step 2. Identify the hole.   The cancellation indicates there is a removable discontinuity (a hole) at x = –3.   To find the y-coordinate of the hole, plug x = –3 into the simplified function:     f(–3) = 1 ⁄ (–3 – 1) = 1 ⁄ (–4) = –1/4.   Thus, there is a hole at (–3, –1/4). Step 3. Find the vertical asymptote.   The vertical asymptote(s) come from the factors in the denominator that were not canceled.   The denominator of the simplified function is x – 1.   Set x – 1 = 0, which gives x = 1.   Thus, there is a vertical asymptote at x = 1. Final Answer:   Hole: (–3, –1/4)   Vertical Asymptote: x = 1.

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To find the vertical asymptotes and holes in the function \( f(x)=\frac{x+3}{(x-1)(x+3)} \), we start by examining the denominator. A vertical asymptote occurs where the denominator equals zero but the numerator does not. Here, the poles are at \( x=1 \) (vertical asymptote) and \( x=-3 \). However, because \( x+3 \) cancels out from both the numerator and denominator, there is a hole at \( x=-3 \). So the answer is: Hole at \( (-3, -1/4) \) and VA at \( x=1 \). When simplifying rational functions, it's easy to overlook common factors that can indicate holes. Remember that wherever the function is undefined due to factors cancelling, you've got a hole instead of a vertical asymptote. Always double-check factors in both the numerator and denominator before drawing conclusions!

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