Homework Help: math

Posted by Kennedy on Monday, December 15, 2008 at 3:57pm.

which of the following functions have a inverse?

f(x)=ab.solute value of x.
f(x)=x^3
f(x)=x^4
f(x)=x^3
f(x)=x^4,xless then or equal 0.

how do i know if they have an inverser, can someone please explain:) thanks for your time YOOO

math - bobpursley, Monday, December 15, 2008 at 4:18pm
x^3 has an inverse, as does x^4 x<=0

Why? The others do not have a one for one mapping from x to one f(x).

for instance, x^4 f(-sqrt2)=f(sqrt2)

http://www.uncwil.edu/courses/mat111hb/functions/inverse/inverse.html#sec1

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