- #1
dranseth
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Homework Statement
I'm a bit puzzled with a limit, as is my teacher. We came across a question that could be both factored or rationalized, but when factored, the answer is different. Perhaps someone has an explanation?
Here it is.
lim ((√x^2+4x)-x)
x->∞
I'm not going to rationalize it, because I know that is right. I'm going to show you how I'm factoring it, and perhaps someone can explain why it is not working. Thanks
lim ((√x^2+4x)-x)
x->∞
lim (x(√1+4/x)-x)
x->∞
lim x((√1+0)-1)
x->∞
lim x(0)
x->∞
lim = 0
x->∞
...