What's the definition amount of : f(x) #sqrt(x+2)/x^3# ?

#sqrt(x+2)/x^3#

1 Answer
Feb 28, 2018

#D_f = [-2, 0)∪(0,∞)#

Explanation:

The (natural) domain of a function is the largest set upon which its outputs are defined.

In this case, #f(x)=sqrt(x+2)/x^3#

The numerator is radical, so must always be non-negative

#x+2≥0 rArr x≥-2#

The denominator must not be zero, so #x≠0#.

Putting these two together, we get the domain as

#D_f=[-2, 0)∪(0,∞)#