Solución

Falso;  limx6f(x)\mathop {\lim }\limits_{x \to 6} f\left( x \right) DNE ya que

limx6f(x)=25=limx6+f(x)\mathop {\lim }\limits_{x \to {6^ - }} f\left( x \right) = 2 \ne 5 = \mathop {\lim }\limits_{x \to {6^ + }} f\left( x \right)