The difference of the squares of two terms, divided by the sum of the same terms, is equal to the difference of the terms. In other words: $\displaystyle\frac{a^2-b^2}{a+b}=a-b$.
Evaluate the limit $\lim_{x\to25}\left(\sqrt{x}+5\right)$ by replacing all occurrences of $x$ by $25$
Calculate the power $\sqrt{25}$
Add the values $5$ and $5$
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