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How would i answer and what would be the answer?

How would i answer and what would be the answer?-example-1
How would i answer and what would be the answer?-example-1
How would i answer and what would be the answer?-example-2
User Freeflow
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1 Answer

4 votes

Given:


f(x)=-(1)/(x-2)+3

We need to find asymptotes of the given function.

Recall that a horizontal asymptote is a horizontal line, y=a, that has the property that either:


\lim _(x\to\infty)f(x)=a

or


\lim _(x\to-\infty)f(x)=a

Taking the limit of the given function, we get


\lim _(x\to\infty)f(x)=\lim _(x\to\infty)(-(1)/(x-2)+3)


\lim _(x\to\infty)f(x)=0+3


\lim _(x\to\infty)f(x)=3

The horizontal asymptote is y=3.

Recall that a vertical asymptote is a vertical line, x=a, that has the property that either:


\lim _(x\to a^-)f(x)=\pm\infty

or


\lim _(x\to a^+)f(x)=\pm\infty

Taking limit to the given function, we get


\lim _(x\to a^+)f(x)=\lim _(x\to a^+)(-(1)/(x-2)+3)

If we take a=2, the limit will be infinity.


\lim _(x\to2^+)f(x)=\lim _(x\to2^+)(-(1)/(x-2)+3)=\infty

Hence the vertical asymptotes x=2.

From these two asymptotes, we can say that the first option or third option would be the graph.

Consider the point (3,2) from the first option graph.

Substitute x=3 and f(3)=2 in the given function, we get


2=-(1)/(3-2)+3


2=-1+3
2=2

The point (3,2) satisfies the given function.

Hence the graph of the function is

How would i answer and what would be the answer?-example-1
User EyalS
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