We have the following limit to prove using delta-epsilon
$\lim_{x \to 1} \frac{x+1}{1+\sqrt{x}}$
It can be manipulated into
$|x-1| |\sqrt{x}-1||\frac{1}{{(1+\sqrt{x})}^{2}}|<\varepsilon$
if our next step is to replicate $\sqrt{x}-1$ in
$-1<|x-1|<1$
should it not be
$0<|\sqrt{x}-1|<\sqrt{2}-1$
instead of the given answer of $0<|\sqrt{x}-1|<1$ ?