Posted by Angela on .
Domain of
a) x^20
b) 1/(x3)
c)1/(4x^221x18)
d) sqrt(4x^221x18)
e) 1/ sqrt(4x^221x18)

Pre Cal/ domain 
Henry,
Domain
a. x^20. All real values of x.
b. 1/(x3).
3 is not in the domain, because it gives a denominator of 0. So the domain is all real values of x except 3:
3 > x >3.
c. 1 / (4x^221x18) =
1 / (x6)(4x+3) .
Domain: All real values of x except 6:
6 > x > 6.
d. sqrt(4x^221x18) =
sqrt((x6)(4x+3)).
Domain: All real values of x that are
=> 6. Values below 6 will result in a
negative value under the radical.
Domain: X => 6.
e. 1 / sqrt(4x^221x18) =
1 / sqrt((x6)(4x+3)).
6 is not in the domain,because it gives a denominator of 0. Values below 6 results in a negative value under the radical. Therefore, all values greater than 6 are in the domain:
Domain: X > 6. 
Pre Cal/ domain 
Lena,
1. sqrt x^25x14
2. cube root x6/sqrt x^2x30
3. y= ln2x12