Can anyone explain to me how to solve the following limit problem? Lim x-->3, u^4-81/u^3-27. Any help would be appreciated!

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Can anyone explain to me how to solve the following limit problem? Lim x-->3, u^4-81/u^3-27. Any help would be appreciated!

Mathematics
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factor the numerator and the denominator
you could also apply l'hospital here
yes, I need to factor and substitution clearly wont work. Having trouble factoring.Hence the request for help :)

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Other answers:

do you know how to factor the difference of squares?
\[a^4-b^4=(a^2)^2-(b^2)^2=(a^2-b^2)(a^2+b^2)=(a-b)(a+b)(a^2+b^2)\]
\[a^3-b^3=(a-b)(a^2+ab+b^2)\]
that should be helpful
thank you I was doing (u^2 +9)(u^2-9). let me take another crack at it and see if I cant factor the denominator. Thanks
yes and u^2-9 can be factor further
factored*
got it, thank you. I realy need t brush up and becme more proficient in basic college algebra skills like square rts and exponents. they still trip me up. The answer is 4 btw :)

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