need some remark about infinite limits :)

Question

anonymous · Answer

attachment

angela210793 · Answer

anonymous · Answer

angela i found an incredible book at universities library :D its really nice ^^ (if its nice then its about maths lol )

angela210793 · Answer

@Satellite wht is tht? I saw it posted somewhere else but....

angela210793 · Answer

@Korcan lol :P
Y work with univ. books? O.o

angela210793 · Answer

u*
sorry have forgotten how to type :(

anonymous · Answer

bahrom7893 · Answer

Infinite limits are usually limits as something approaches infinity..

bahrom7893 · Answer

and well usually you have to be smart to solve them, or use l'hopital's rule.. which only works if you have an undeterminate form..

anonymous · Answer

yes angela :)

anonymous · Answer

sometimes they are easy. if you have a rational function and ask for 
$$\lim_{x->\infty}\frac{P(x)}{Q(x)}$$  you just look at the degees

anonymous · Answer

ok .) can you give some example please? i think i got the theory :) what about practice?

bahrom7893 · Answer

okay here's one:
limit as x->infinity (5x^3-4x)/(7x^2-6x^3)

anonymous · Answer

what about this : $$\lim_{x \rightarrow -1+}2 / X + 1$$

bahrom7893 · Answer

-1

anonymous · Answer

ok ^^

anonymous · Answer

@bahrom7893
"limit as x->infinity (5x^3-4x)/(7x^2-6x^3)"

Divide everything by 6x^3 and inspect?

bahrom7893 · Answer

@estudier, sorry was away, the answer is just -5/6 just look at the highest power and if they are equal find the coefficient

anonymous · Answer

Yes, I got the same with my plodding method....