the problem is

the lim as x approaches inifinity of

√(9x^6 - 1)/(x^3 - 1)

Correct Answer: 3

the 1's are constants being subtracted, not being subtracted from the exponents themselves.

I tried mulitplying both by 9x^6-1 but it just wasn't a good time and I couldn't see it ever working out.

I tired multiplying by 1/x but that wasn't really a tea party either. I'm really at a loss of what to do but I figure i'll end up with 3 in the num. and 1 in the denom since the final answer is 3.