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What is the vertical asymptote of (f(x)=\frac{1}{x+5})?

Answer and explanation

Correct answer: (x=-5)

A vertical asymptote is a vertical line near which the function becomes unbounded because the function is not defined there. For a reciprocal function of the form one divided by an expression, first find where the denominator becomes zero. That value of x gives the possible vertical asymptote, provided no cancellation removes the restriction.

Here the denominator is x+5. Solving x+5=0 gives x=-5. Therefore the graph approaches the vertical line x=-5, so option B is correct. The lines y=5 and y=-5 are horizontal lines, not vertical ones, while x=5 would come from incorrectly changing the sign.

Related tags

Standard-FunctionsReciprocal-FunctionVertical-Asymptote

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