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Question Number 145549 by physicstutes last updated on 05/Jul/21
Find the equation of the asymptotes to the curve   y = f(x) where f(x) = ln(((x+3)/(x−1))) .
$$\mathrm{Find}\:\mathrm{the}\:\mathrm{equation}\:\mathrm{of}\:\mathrm{the}\:\mathrm{asymptotes}\:\mathrm{to}\:\mathrm{the}\:\mathrm{curve} \\ $$$$\:{y}\:=\:{f}\left({x}\right)\:\mathrm{where}\:{f}\left({x}\right)\:=\:\mathrm{ln}\left(\frac{{x}+\mathrm{3}}{{x}−\mathrm{1}}\right)\:.\: \\ $$
Answered by gsk2684 last updated on 06/Jul/21
function is defined only if   0<((x+3)/(x−1))⇒0<(x+3)(x−1)  x<(−3) or 1<x   function has asymptotes at   x=−3,1 also function never be 0.  x axis is also an asymptote.
$$\mathrm{function}\:\mathrm{is}\:\mathrm{defined}\:\mathrm{only}\:\mathrm{if}\: \\ $$$$\mathrm{0}<\frac{\mathrm{x}+\mathrm{3}}{\mathrm{x}−\mathrm{1}}\Rightarrow\mathrm{0}<\left(\mathrm{x}+\mathrm{3}\right)\left(\mathrm{x}−\mathrm{1}\right) \\ $$$$\mathrm{x}<\left(−\mathrm{3}\right)\:\mathrm{or}\:\mathrm{1}<\mathrm{x}\: \\ $$$$\mathrm{function}\:\mathrm{has}\:\mathrm{asymptotes}\:\mathrm{at}\: \\ $$$$\mathrm{x}=−\mathrm{3},\mathrm{1}\:\mathrm{also}\:\mathrm{function}\:\mathrm{never}\:\mathrm{be}\:\mathrm{0}. \\ $$$$\mathrm{x}\:\mathrm{axis}\:\mathrm{is}\:\mathrm{also}\:\mathrm{an}\:\mathrm{asymptote}. \\ $$
Commented by gsk2684 last updated on 06/Jul/21

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