Sunday, March 11, 2012

What is the value of : [(x - 64)^(1/3) - 4]/x for x tending to 0?

In other words, we'll have to evaluate the limit of the
fraction, if x approaches to 0:


We'll replace x by 0, we'll
get:


lim [(x - 64)^(1/3) - 4]/x = [(0 - 64)^(1/3) -
4]/0


lim [(x - 64)^(1/3) - 4]/x = [(-64)^(1/3) -
4]/0


But (-64)^(1/3) = -4


lim
[(x - 64)^(1/3) - 4]/x = (-4 - 4)/0


lim [(x - 64)^(1/3) -
4]/x = -8/0


lim [(x - 64)^(1/3) - 4]/x = -
infinite


When x approches to 0, the value of
the fraction [(x - 64)^(1/3) - 4]/x tends to -
infinite.

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