FINDING HOLES AND VERTICAL ASYMPTOTES WORKSHEET

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Describe the vertical asymptotes and holes for the graph of each rational function.

Problem 1 :

y=x-2(x+2)(x-2)

Solution

Problem 2 :

y=xx(x-1)

Solution

Problem 3 :

y=5-xx2-1

Solution

Problem 4 :

y = x2-2x+2

Solution

Problem 5 :

y=x2-4x2+4

Solution

Problem 6 :

y=x+3x2-9

Solution

Problem 7 :

y=x2-25x-4

Solution

Problem 8 :

y=(x-2)(2x+3)(5x+4)(x-3)

Problem 9 :

y=15x2-7x-2x2-4

Solution

Problem 10 :

Suppose you start a home business typing technical research papers for college students. You must spend $3500 to replace your computer system. Then you estimate the cost of typing each page will be $0.02.

a. Write a rational function modeling your average cost per page. Graph the function.

b. How many pages must you type to bring your average cost per page to less than $1.50 per page, the amount you plan to charge?

Solution

Answer Key

1) Vertical asymptotes are x = -2 and x = 2.

There is a hole at x = 2.

2)  Vertical asymptotes are x = 0 and x = 1.

There is a hole at x = 0.

3)  Vertical asymptotes are x = 1 and x = -1.

There is no hole for the given rational function

4)  vertical asymptote is x = -2.

There is no hole for the given rational function.

5) There is no asymptote.

There is no hole for the given rational function.

6)  vertical asymptotes are x = -3 and x = 3.

There is a hole at x = -3.

7)  Vertical asymptote is x = 4.

there is no hole for the given rational function.

8)  vertical asymptotes are x = -4/5 and x = 3.

there is no hole for the given rational function.

9)  the vertical asymptotes are x = 2 and x = -2.

there is no hole for the given rational function.

10) a)

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b. Average cost should be less than 1.50.

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