Hey, i have this question i can't figure out.

It's

Use the identity (a-b)(a+b)=a^2-b^2 and the arithmetic of limits to evaluate

lim root(4+5x) - 5/

x approaches 1 x-1

So plug in 1, it's undefined. I tried a few things, rationalizing the denominator, timesing by the conjugate, to try and get rid of the 0 on the bottom but didnt really get anywhere.

I'm not really sure what to do next.

Thanks in advanced for whoever helps.