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Published byFrank Stevens Modified over 9 years ago
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Problem of the Day x 0 0.5 1.0 1.5 2.0 f(x) 3 3 5 8 13 A table of values for a continuous function f is shown above. If four equal subintervals of [0, 2] are used, which of the following is the trapezoidal approximation of A) 8 B) 12 C) 16 D) 24 E) 32
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Problem of the Day x 0 0.5 1.0 1.5 2.0 f(x) 3 3 5 8 13 A) 8 B) 12 C) 16 D) 24 E) 32
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Graph f(x) = ln x Graph f(x) = e x What do you notice about these 2 functions and their relationship?
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Graph f(x) = ln x Graph f(x) = e x What do you notice about these 2 functions and their relationship? They appear to be reciprocals of each other and thus inverses.
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The inverse of the natural logarithmic function f(x) = ln x is called the natural exponential function and is denoted by f -1 (x) = e x i.e. y = e x if and only if x = ln y And ln(e x ) = x and e ln x = x (inverse property)
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Examples 7 = e x + 1 ln 7 = ln(e x + 1 ) ln 7 = x + 1 ln 7 - 1 = x.946 ≈x natual log both sides and apply inverse property
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Examples ln(2x - 3) = 5 e ln(2x - 3) = e 5 2 x - 3 = e 5 x = ½(e 5 + 3) x ≈ 75.707 exponential both sides and apply inverse property
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Caution! cannot do if multiple pieces on each side of = ln(5x + 1) + ln x = ln 4 (5x + 1) + x = 4 Incorrect Correct ln(5x + 1)x = ln 4 (5x + 1)x = 4
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Operations and Properties e a e b = e a + b ea = e a - b eb 1. Domain (-∞, ∞) 2. Range (0, ∞) 3. continuous, increasing, 1 to 1 4. concave up 5. lim e x = 0 lim e x = ∞ x -∞ x ∞
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Derivatives (the natural exponential function is the only function besides the zero function that is its own derivative)
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Examples u = 2x -1 du = 2 u = -3x -1 d u = (-3)(-1)x -2
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How Fast Does a Flu Spread? The spread of a flu in a certain school is modeled by the equation P(t) = 100 1 + e 3 - t w here P(t) = total number of students infected t days after the flu was first noticed. Many of them may already be well again at time t. Estimate the initial number of students infected with the flu
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How Fast Does a Flu Spread? The spread of a flu in a certain school is modeled by the equation P(t) = 100 1 + e 3 - t w here P(t) = total number of students infected t days after the flu was first noticed. Many of them may already be well again at time t. Estimate the initial number of students infected with the flu t = 0 P(0) = 100 = 5 1 + e 3 - 0
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How Fast Does a Flu Spread? The spread of a flu in a certain school is modeled by the equation P(t) = 100 1 + e 3 - t w here P(t) = total number of students infected t days after the flu was first noticed. Many of them may already be well again at time t. How fast is the flu spreading after 3 days (i.e. rate of change)
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How Fast Does a Flu Spread? at t = 3 100e 0 = 25 (1 + e 0 ) 2
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