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.

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) (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 make the denominator be equal to 0? That's your answer.
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