Posted by **Angela** on Sunday, July 24, 2011 at 8:51pm.

Domain of

a) x^20

b) 1/(x-3)

c)1/(4x^2-21x-18)

d) sqrt(4x^2-21x-18)

e) 1/ sqrt(4x^2-21x-18)

- Pre Cal/ domain -
**Henry**, Monday, July 25, 2011 at 8:10pm
Domain

a. x^20. All real values of x.

b. 1/(x-3).

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^2-21x-18) =

1 / (x-6)(4x+3) .

Domain: All real values of x except 6:

6 > x > 6.

d. sqrt(4x^2-21x-18) =

sqrt((x-6)(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^2-21x-18) =

1 / sqrt((x-6)(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**, Monday, August 6, 2012 at 1:31pm
1. sqrt x^2-5x-14

2. cube root x-6/sqrt x^2-x-30

3. y= ln2x-12

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