I need a good explanation on how to complete the following problem.
The limit as x approaches infinity...(64x^2 +x "which is under a square root"
- 8x)
Thanks very much
There is a standard trick for dealing with expressions like this. Make it into a fraction, multiplying top and bottom by the "conjugate" expression (got by changing the – sign to a +):
Multiply out the numerator (difference of two squares) and see if you can figure out what then happens as x→∞.