$25)\\ a) \displaystyle\lim_{x \to 2^-} f(x)=\displaystyle\lim_{x \to 2^+} f(x)=-\infty\\ \Rightarrow \displaystyle\lim_{x \to 2} f(x)=-\infty\\ b)\displaystyle\lim_{x \to 5^-} f(x)=\displaystyle\lim_{x \to 5^+} f(x)=\infty\\ \Rightarrow \displaystyle\lim_{x \to 5} f(x)=\infty\\ c)\displaystyle\lim_{x \to (-3)^-} f(x)=-\infty\\ d)\displaystyle\lim_{x \to (-3)^+} f(x)=\infty\\ 26)\\ a)\displaystyle\lim_{x \to (-7)^-} f(x)=\displaystyle\lim_{x \to (-7)^+} f(x)=-\infty\\ \Rightarrow \displaystyle\lim_{x \to (-7)} f(x)=-\infty\\ b)\displaystyle\lim_{x \to (-3)^-} f(x)=\displaystyle\lim_{x \to (-3)^+} f(x)=\infty\\ \Rightarrow \displaystyle\lim_{x \to (-3)} f(x)=\infty\\ c)\displaystyle\lim_{x \to 0^-} f(x)=\displaystyle\lim_{x \to 0^+} f(x)=\infty\\ \Rightarrow \displaystyle\lim_{x \to 0} f(x)=\infty\\ d)\displaystyle\lim_{x \to 6^-} f(x)=-\infty\\ e)\displaystyle\lim_{x \to 6^+} f(x)=\infty$
