limi as x-> positive infinity x+r((x^2)+2x)
The Attempt at a Solution
multiply by conjugate x-r((x^2)+2x)
I get (x^2)-(x^2)+2x/x-r((x^2)+2x)
Which becomes 2x/x-r((x^2)+2x)
Which I end up with 2/1-r(1-(2/x))
But I go wrong somewhere because I end up with 2/0 and the answer is positive infinity. I keep getting undefined and I can't see where I'm going wrong. Could someone point it out?