Question

@Michele_Laino

Answer 1

only the first fnction, namely:
\[f(x)=\frac{ x ^{2}-25 }{x+5 }\]

Answer 2

no, because, in scond case, we can eliminate the apparent singularity, obtaining the subsequent function:
\[f(x)=x+5\]which is equals to 10 if x=5