- #1

Glissando

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## Homework Statement

Find the vertical asymptotes of:

f(x) = (x^2-1)/(x^2-4)

## Homework Equations

Limits, zeroes

## The Attempt at a Solution

Sorry about the mess...not too sure how to type some of this ):

lim (2^2-1)/(2^2-4) = 0+

x->2+

lim

x->2- (2^2-1)/(2(-)^2-4) = 0+

and lim as x -> -2...

I essentially understand how to do these problems (Find the zeroes of the denominator and find the limit as it approaches that number). What I don't understand is what happens to the (-) when x^2. For example in the above question, when the limit approaches 2 from the left (2-), when you square it does the (-) become positive, yielding 0+? Or does it not follow rules of squaring negative numbers and remain as 0-?