# Math Help - Limits help!!!

1. ## Limits help!!!

How to find $\lim_{t \to 0} \frac{3-\sqrt{9-4t^2}}{2t}$

and why is $\lim_{t \to 0} \frac{3+\sqrt{9-4t^2}}{2t}$ undefined?

2. Originally Posted by usagi_killer
How to find $\lim_{t \to 0} \frac{3-\sqrt{9-4t^2}}{2t}$

and why is $\lim_{t \to 0} \frac{3+\sqrt{9-4t^2}}{2t}$ undefined?
Hi

For the first one multiply numerator and denominator by $3+\sqrt{9-4t^2}$

For the second one the limit of the numrator is 6, whereas the limit of the denominator is 0