function

**fabxx** · September 17th 2008, 08:28 AM

For the function f, defined below, what are all the values of x for which f(x) is a real number?

f(x)=(x+1)^3/4

**masters** · September 17th 2008, 09:27 AM

Originally Posted by fabxx

For the function f, defined below, what are all the values of x for which f(x) is a real number?

f(x)=(x+1)^3/4

$f(x)=\sqrt[4]{(x+1)^3}$

Within the set of real numbers, we cannot have an even root of a negative number. What values of x will make $(x+1)^3$ netative?

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