How do you find the limit of #f(x)= (3x^2 - 9x - 12) / (x^2 + 2x -24)# as x approaches 4?
2 Answers
Apr 21, 2015
Use l'Hospital's rule.
When both the numerator and the denominator give 0 when the limiting x-value is plugged into them, you should you l'Hospital's rule to find the answer. This is how you do it:
- Take the derivative of the top and bottom.
- The original limit is equal to the ratio of the two functions you have just obtained by taking the derivatives.
Apr 21, 2015
Now, applying limit as