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# Find the domain of the rational function please

Find the domain of the rational expression (Show all work)

R(x)= -7-6x/x^3-5x^2+6x

### 2 Answers by Expert Tutors

Michael F. | Mathematics TutorMathematics Tutor
4.7 4.7 (6 lesson ratings) (6)
1

R(x)= -7-6x/x^3-5x^2+6x submitted, I am going to assume you meant
R(x)= (-7-6x)/(x³-5x²+6x)=-(7+6x)/(x(x²-5x+6)=-(7+6x)/(x(x-3)(x-2))
The function is definable except where x=0 or 2 or 3.
The domain D is the complement, in the real line, of these points.
D=(-∞,0)∪(0,2)υ(2,3)∪(3,∞)

Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
3.0 3.0 (1 lesson ratings) (1)
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### (-infinity, 0)(1)(4, +infinity)

Your assessment of the domain as
x cannot equal 3 and x cannot equal 2 and x cannot equal 0
is clearly correct, however your description should be the domain is (-∞,0)∪(0,2)∪(2,3)∪(3,∞), the parentheses indicating that the intervals do not contain their end points
Thank you!
If I understand correctly, the U denotes the fact that "the parentheses indicate that the intervals do not contain their end points".
If there is no U, then the parentheses indicate that the intervals are inclusive of their end points.
I never before encountered the symbol of U.
Thank you!
If I understand correctly, the U denotes the fact that "the parentheses indicate that the intervals do not contain their end points".
If there is no U, then the parentheses indicate that the intervals are inclusive of their end points.
I never before encountered the symbol of U.
Thank you!
If I understand correctly, the U denotes the fact that "the parentheses indicate that the intervals do not contain their end points".
If there is no U, then the parentheses indicate that the intervals are inclusive of their end points.
I never before encountered the symbol of U.
Thank you!
If I understand correctly, the U denotes the fact that "the parentheses indicate that the intervals do not contain their end points".
If there is no U, then the parentheses indicate that the intervals are inclusive of their end points.
I never before encountered the symbol of U.
Thank you!
If I understand correctly, the U denotes the fact that "the parentheses indicate that the intervals do not contain their end points".
If there is no U, then the parentheses indicate that the intervals are inclusive of their end points.
I never before encountered the symbol of U.
Thank you!
If I understand correctly, the U denotes the fact that "the parentheses indicate that the intervals do not contain their end points".
If there is no U, then the parentheses indicate that the intervals are inclusive of their end points.
I never before encountered the symbol of U.
Thank you!
If I understand correctly, the U denotes the fact that "the parentheses indicate that the intervals do not contain their end points".
If there is no U, then the parentheses indicate that the intervals are inclusive of their end points.
I never before encountered the symbol of U.
Thank you!
If I understand correctly, the U denotes the fact that "the parentheses indicate that the intervals do not contain their end points".
If there is no U, then the parentheses indicate that the intervals are inclusive of their end points.
I never before encountered the symbol of U.
Thank you!
If I understand correctly, the U denotes the fact that "the parentheses indicate that the intervals do not contain their end points".
If there is no U, then the parentheses indicate that the intervals are inclusive of their end points.
I never before encountered the symbol of U.
Thank you!
If I understand correctly, the U denotes the fact that "the parentheses indicate that the intervals do not contain their end points".
If there is no U, then the parentheses indicate that the intervals are inclusive of their end points.
I never before encountered the symbol of U.
Thank you!
If I understand correctly, the U denotes the fact that "the parentheses indicate that the intervals do not contain their end points".
If there is no U, then the parentheses indicate that the intervals are inclusive of their end points.
I never before encountered the symbol of U.
No! the parentheses ( and ) indicate no endpoints.  The symbol ∪ means set union.
Michael F.