Help with problem
08-05-2019, 07:19 PM
Post: #5
 ijabbott Senior Member Posts: 781 Joined: Jul 2015
RE: Help with problem
(08-05-2019 12:32 PM)Marcel Wrote:  Hi!
For myself I prefert to do a simplification before using de domain function!
After that, the domain is OK…
Choice A with -5.
Marcel

Technically, doesn't simplifying $$\frac{x-5}{x^2-25}$$ to $$\frac{1}{x+5}$$ change the domain? I know the original approaches $$\frac{1}{10}$$ in the limit as $$x \to 5$$, but it should probably have an open circle at $$(5, \frac{1}{10})$$.

— Ian Abbott
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