MATH 1310 Section 4.4.

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Presentation transcript:

MATH 1310 Section 4.4

Rational Functions

To summarize: 𝐿𝑎𝑟𝑔𝑒𝑟 𝐷𝑒𝑔𝑟𝑒𝑒 𝑆𝑚𝑎𝑙𝑙𝑒𝑟 𝐷𝑒𝑔𝑟𝑒𝑒 :𝐻𝐴 𝑑𝑜𝑒𝑠 𝑛𝑜𝑡 𝑒𝑥𝑖𝑠𝑡 𝑆𝑚𝑎𝑙𝑙𝑒𝑟 𝐷𝑒𝑔𝑟𝑒𝑒 𝐿𝑎𝑟𝑔𝑒𝑟 𝐷𝑒𝑔𝑟𝑒𝑒 :𝐻𝐴 𝑖𝑠 𝑎𝑡 𝑦=0 𝐸𝑞𝑢𝑎𝑙 𝐷𝑒𝑔𝑟𝑒𝑒 𝐸𝑞𝑢𝑎𝑙 𝐷𝑒𝑔𝑟𝑒𝑒 :𝐻𝐴 𝑒𝑥𝑖𝑠𝑡𝑠:𝑦=(𝑞𝑢𝑜𝑡𝑖𝑒𝑛𝑡 𝑜𝑓 𝑙𝑒𝑎𝑑𝑖𝑛𝑔 𝑐𝑜𝑒𝑓𝑓𝑖𝑐𝑖𝑒𝑛𝑡𝑠)

Popper 23: Answer the following for the function: 𝑓 𝑥 = 3𝑥 2 −27 𝑥 2 −𝑥−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 = ½ c. y = 3 d. None

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.

Popper 24: 𝑓 𝑥 = 2𝑥 2 −4𝑥−70 𝑥 2 −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)

B A C D