SOLUTION: Please help me find all rational numbers for which the rational expression is not defined. x^2+x+105 over 5x-45.
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Question 107516This question is from textbook Intermediate Algebra
: Please help me find all rational numbers for which the rational expression is not defined. x^2+x+105 over 5x-45.
This question is from textbook Intermediate Algebra
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given function
Set the denominator equal to zero. Remember, dividing by 0 is undefined. So if we find values of x that make the denominator zero, then we must exclude them from the domain.
Add 45 to both sides
Combine like terms on the right side
Divide both sides by 5 to isolate x
Divide
--------------------------------------------------------------
Answer:
So our answer is
Since makes the denominator equal to zero, this means we must exclude from our domain
So our domain is: 
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