Unformatted text preview: . Since x = −2 continues to produce a 0 in the
x+2
x+4
(x+2)2
denominator of the reduced function, we know x = −2 is a vertical asymptote to the graph,
which the calculator conﬁrms. The graph of y = h(x) The graph of y = r(x) Our next example gives us a physical interpretation of a vertical asymptote. This type of model
arises from a family of equations cheerily named ‘doomsday’ equations.6 The unfortunate name
will make sense shortly.
Example 4.1.3. A mathematical model for the population P , in thousands, of a certain species of
bacteria, t days after it is introduced to an environment is given by P (t) = (5100)2 , 0 t < 5.
−t
1. Find and interpret P (0).
2. When will the population reach 100,000?
6 This is a class of Calculus equations in which a population grows very rapidly. 238 Rational Functions 3. Determine the behavior of P as t → 5− . Interpret this result graphically and within the
context of the problem.
Solution.
1. Substituting t = 0 gives P (0) =
into the environment. 100
(5−0)2 = 4, which me...
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 Fall '13
 Wong
 Algebra, Trigonometry, Cartesian Coordinate System, The Land, The Waves, René Descartes, Euclidean geometry

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