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June 19, 2013

# Homework Help: calculus test corrections. 1 question

Posted by jonna on Tuesday, April 10, 2012 at 8:01pm.

Which is true for the graph of x^2-9/x^2-4
the answer is vertical asymptotes at x = ±2 but i dont understand why.

• calculus test corrections. 1 question - bobpursley, Tuesday, April 10, 2012 at 8:02pm

look at the denominator. What happens to a function which has a zero in the denominator?

• calculus test corrections. 1 question - jonna, Tuesday, April 10, 2012 at 8:13pm

i dont understand what you mean

• calculus test corrections. 1 question - Steve, Wednesday, April 11, 2012 at 12:04pm

consider y = 1/x

division by zero is not defined. The closer x gets to 0, the larger y gets. At x=0, y is undefined, infinitely large.

Same for this problem. What happens to y as x gets close to 2? x^2-4 gets close to 0, and you cannot divide by 0.

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