Find the Limit of (x + x^3 + x^5)/(1 - x^2 + x^4) as x approaches Infinity

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Find the Limit of (x + x^3 + x^5)/(1 - x^2 + x^4) as x approaches Infinity

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I was taught to divide the numerator and denominator by the highest order power in the denominator and then to just use limits normally.
Using l'hopital's rule 4 times would give lim x -> inf (5!x/4!) which is simple enough.
This method of largest exponentiation was refered to as a bit risky if you're not sure what type overpowers the others.

kozokosa
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My Calculus teacher taught us this method but pointed out that this doesn't work in a few rare cases. He showed us the problem: limit x-> infinity sqrt(9x^2+x)-3x. If you attempt to ignore the +x term in the radical you will get limit x-> infinity sqrt(9x^2)-3x which should equal 0, but this is wrong and the actual answer is 1/6. If you instead multiply by the conjugate on the top and bottom and then proceed to ignore the +x term this time you will get the right answer of 1/6.

lavamob
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We can also solve it by  L' Hopital's rule

Maths_.
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The actual answer is that it has no limit - you cannot approach infinity.

davidreynolds
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We divide each term by the highest power of x and 1/x^r=0 so I thought it was 1.

joshuakennedy