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MATH 1310 Section 4.4.

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Presentation on theme: "MATH 1310 Section 4.4."β€” Presentation transcript:

1 MATH 1310 Section 4.4

2 Rational Functions

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9 To summarize: πΏπ‘Žπ‘Ÿπ‘”π‘’π‘Ÿ π·π‘’π‘”π‘Ÿπ‘’π‘’ π‘†π‘šπ‘Žπ‘™π‘™π‘’π‘Ÿ π·π‘’π‘”π‘Ÿπ‘’π‘’ :𝐻𝐴 π‘‘π‘œπ‘’π‘  π‘›π‘œπ‘‘ 𝑒π‘₯𝑖𝑠𝑑 π‘†π‘šπ‘Žπ‘™π‘™π‘’π‘Ÿ π·π‘’π‘”π‘Ÿπ‘’π‘’ πΏπ‘Žπ‘Ÿπ‘”π‘’π‘Ÿ π·π‘’π‘”π‘Ÿπ‘’π‘’ :𝐻𝐴 𝑖𝑠 π‘Žπ‘‘ 𝑦=0 πΈπ‘žπ‘’π‘Žπ‘™ π·π‘’π‘”π‘Ÿπ‘’π‘’ πΈπ‘žπ‘’π‘Žπ‘™ π·π‘’π‘”π‘Ÿπ‘’π‘’ :𝐻𝐴 𝑒π‘₯𝑖𝑠𝑑𝑠:𝑦=(π‘žπ‘’π‘œπ‘‘π‘–π‘’π‘›π‘‘ π‘œπ‘“ π‘™π‘’π‘Žπ‘‘π‘–π‘›π‘” π‘π‘œπ‘’π‘“π‘“π‘–π‘π‘–π‘’π‘›π‘‘π‘ )

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13 Popper 25: Answer the following for the function: 𝑓 π‘₯ = 3π‘₯ 2 βˆ’27 π‘₯ 2 βˆ’π‘₯βˆ’6 1. Determine the location (if any) of vertical asymptotes. x = 2 b. x = 3 c. x = -2 d. None 2. Determine the location (if any) of any holes. x = -2 b. x = 3 c. x = -3 d. None Determine the y-coordinate of the hole. 18/5 b. 3 c. 27/5 d. 3/2 4. Determine the location (if any) of horizontal asymptotes a. y = 9/2 b. y = Β½ c. y = 3 d. None

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15 Quick Summary of Rational Functions:
Domain: Exclude any values that make denominator equal zero Vertical Asymptote: x = k, when (x – k) appears in denominator only Hole: x = m, when (x – m) appears in both numerator and denominator [To find y-value of hole, simplify the function and plug in m] Horizontal Asymptote: compare degree of numerator and denominator: n > d, no HA; n < d, HA is y = 0; n = d, HA is ratio of leading coefficients. x-intercepts: x = n, where (x – n) appears in numerator only y-intercept: the value of f(0) Note: There is no guarantee all of these will appear in each rational function.

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19 Popper 26: 𝑓 π‘₯ = 2π‘₯ 2 βˆ’4π‘₯βˆ’70 π‘₯ 2 βˆ’49 Find the domain
a. (-∞, 7) b. (-∞, -7) U (7, ∞) c. (-∞, -7) U (-7, 7) U (7, ∞) d. (-∞, ∞) 2. Find any holes a. x = -7, 7 b. x = -7 c. x = 7 d. None 3. Find any vertical asymptotes 4. Find any horizontal asymptotes a. y = 0 b. y = -5 c. y = 2 d. None 5. Find any x-intercepts a. x = -5, 7 b. x = -5 c. x = 7 d. None 6. Find any y-intercepts a. y = -70 b. y = -10/7 c. y = 10/7 d. None 7. Sketch (choices on next slide)

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