SOLUTION: Find all number for which the rational expression is not defined: (d-2)/(7-d) This is as far as I have gotten however I do not think I am going about this problem correctly.

Algebra ->  Rational-functions -> SOLUTION: Find all number for which the rational expression is not defined: (d-2)/(7-d) This is as far as I have gotten however I do not think I am going about this problem correctly.       Log On


   

Question 145014: Find all number for which the rational expression is not defined:
(d-2)/(7-d)
This is as far as I have gotten however I do not think I am going about this problem correctly. Please help.
= (d-2)/(-d+7)
= -d^2+2d+7d-14
= -d^2+9d-14
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!
The only way for this rational expression to be undefined is for the denominator to be 0. What value(s) of the variable d make the denominator be equal to 0? That's your answer.