- #1
sara_87
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Homework Statement
calculate the limit as x tends to infinity of:
[tex]\sqrt[3]{x}[/tex] ((x+1)[tex]^{(2/3)}[/tex]-(x-1)[tex]^{(2/3)}[/tex])
Homework Equations
The Attempt at a Solution
using the identity: a-b=(a^2-b^2)/(a+b) ; and dividing top and bottom by x,
= lim [tex]\frac{x^{(1/3)}[(1+1/x)^{(4/3)}-(1-1/x)^{(4/3)}}{(1+1/x)^{(2/3)}+(1-1/x)^{(2/3)}}[/tex]
= infinity
is that right? it seems very wrong.