Download - 9.2 Graphing Simple Rational Functions
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9.2 Graphing Simple Rational Functions
(p. 540)
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Rational Function
• A function of the form
where p(x) & q(x) are polynomials and q(x)≠0.
)(
)()(
xq
xpxf
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Hyperbola
• A type of rational function.
• Has 1 vertical asymptote and 1 horizontal asymptote.
• Has 2 parts called branches. (blue parts) They are symmetrical.
We’ll discuss 2 different forms.
x=0
y=0
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Hyperbola (continued)Hyperbola (continued)
• One form:
• Has 2 asymptotes: x=h (vert.) and y=k (horiz.)
• Graph 2 points on either side of the vertical asymptote.
• Draw the branches.
khx
ay
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Hyperbola (continued)
• Second form:
• Vertical asymptote: Set the denominator equal to 0 and solve for x.
• Horizontal asymptote:
• Graph 2 points on either side of the vertical asymptote. Draw the 2 branches.
dcx
baxy
c
ay
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Ex: Graph State the domain & range.
21
3
x
y
Vertical Asymptote: x=1
Horizontal Asymptote: y=2
x y
-5 1.5
-2 1
0 -1
4 3Domain: all real #’s except 1.
Range: all real #’s except 2.
Left of vert.
asymp.
Right of vert.
asymp.
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Ex: GraphState domain & range.Vertical asymptote:3x+3=0 (set denominator =0)
3x=-3
x= -1
Horizontal Asymptote:
c
ay
3
1y
x y
-3 .83
-2 1.33
0 -.67
2 0
Domain: All real #’s except -1.
Range: All real #’s except 1/3.
33
2
x
xy
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Assignment