- #1
Wonderballs
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Homework Statement
lim |x-1|/x^3-1
x-->1+
Homework Equations
The Attempt at a Solution
This is from a "practise test" and the prof wrote his solution on it... I'm having a hard time figuring out why (x^3-1) = (x-1)(x^2+x+1) which is what he used to find the limit... I am fine at figureing out limits but I just have no idea how he figures those two equations are equal because when i multiply through i get (x^3-2x^2+2x-1)