Wednesday, June 10, 2015

What is the limit of the fraction (x^3-2x^2)/(x-2) for x-->2 ?

We notice that substituting x by 2, we'll get a
indetermination case:


lim  (x^3-2x^2)/(x-2) = (8 - 8)/(2-2)
= 0/0


We'll factorize the numerator by
x^2:


lim  (x^3-2x^2)/(x-2) = lim x^2(x -
2)/(x-2)


We'll simplify and we'll
get:


lim x^2(x - 2)/(x-2) = lim
x^2


We'll substitute x by
2:


lim x^2 =
2^2


lim  (x^3-2x^2)/(x-2) =
4

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