# Math Help - function

1. ## function

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

2. 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?