# evaluate the following limits

• Aug 8th 2012, 11:28 PM
arsenal12345
evaluate the following limits
7x^9-4x^5+2x-13/ -3x^9+x^8-5x+2x

lim-- infinity

and these

2x^2+1/6+x-3x^2

lim ---- infinity
• Aug 9th 2012, 05:11 AM
emakarov
Re: evaluate the following limits
Quote:

Originally Posted by arsenal12345
7x^9-4x^5+2x-13/ -3x^9+x^8-5x+2x

lim-- infinity

Please confirm that the expression whose limit you need to find is exactly as written above.
• Aug 9th 2012, 05:54 AM
Prove It
Re: evaluate the following limits
Quote:

Originally Posted by arsenal12345
7x^9-4x^5+2x-13/ -3x^9+x^8-5x+2x

lim-- infinity

and these

2x^2+1/6+x-3x^2

lim ---- infinity

Am I correct in assuming that these are \displaystyle \displaystyle \begin{align*} \lim_{x \to \infty}\frac{7x^9 - 4x^5 + 2x - 13}{-3x^2 + x^8 - 5x + 2x} \end{align*} and \displaystyle \displaystyle \begin{align*} \lim_{x \to \infty}\frac{2x^2 + 1}{6+x-3x^2} \end{align*}?

Next time please either learn some LaTeX or else at least use brackets where they're needed to make the expressions make sense.
• Aug 9th 2012, 06:57 AM
HallsofIvy
Re: evaluate the following limits
Quote:

Originally Posted by Prove It
Am I correct in assuming that these are \displaystyle \displaystyle \begin{align*} \lim_{x \to \infty}\frac{7x^9 - 4x^5 + 2x - 13}{-3x^2 + x^8 - 5x + 2x} \end{align*} and \displaystyle \displaystyle \begin{align*} \lim_{x \to \infty}\frac{2x^2 + 1}{6+x-3x^2} \end{align*}?

Next time please either learn some LaTeX or else at least use brackets where they're needed to make the expressions make sense.

Just to clarify, you mean \displaystyle \displaystyle \begin{align*} \lim_{x \to \infty}\frac{7x^9 - 4x^5 + 2x - 13}{-3x^9 + x^8 - 5x + 2x} \end{align*}

arsenal12345, divide both numerator and denominator by the highest power of x ($\displaystyle x^9$ in the first problem, $\displaystyle x^2$ in the second).
• Aug 9th 2012, 07:20 AM
Prove It
Re: evaluate the following limits
Quote:

Originally Posted by HallsofIvy
Just to clarify, you mean \displaystyle \displaystyle \begin{align*} \lim_{x \to \infty}\frac{7x^9 - 4x^5 + 2x - 13}{-3x^9 + x^8 - 5x + 2x} \end{align*}

arsenal12345, divide both numerator and denominator by the highest power of x ($\displaystyle x^9$ in the first problem, $\displaystyle x^2$ in the second).

I don't see any difference...
• Aug 9th 2012, 07:25 AM
emakarov
Re: evaluate the following limits
Quote:

Originally Posted by Prove It
Am I correct in assuming that these are \displaystyle \displaystyle \begin{align*} \lim_{x \to \infty}\frac{7x^9 - 4x^5 + 2x - 13}{-3x^2 + x^8 - 5x + 2x} \end{align*}

In the denominator, it should say $\displaystyle -3x^9$, not $\displaystyle -3x^2$.
• Aug 9th 2012, 07:27 AM
Prove It
Re: evaluate the following limits
Ah right, I think I must need glasses :P

*Awkwardly realises I'm already wearing glasses ><
• Aug 9th 2012, 12:25 PM
arsenal12345
Re: evaluate the following limits
yes u have assumed currecct man , i will try next time ,

so how do i solve them ?
• Aug 9th 2012, 12:28 PM
emakarov
Re: evaluate the following limits
Quote:

Originally Posted by HallsofIvy
arsenal12345, divide both numerator and denominator by the highest power of x ($\displaystyle x^9$ in the first problem, $\displaystyle x^2$ in the second).

.