$$\lim_{x \to 5^-}\left(x^{2} - 8 x + 15\right) = 0$$ More at x→5 from the left $$\lim_{x \to 5^+}\left(x^{2} - 8 x + 15\right) = 0$$ $$\lim_{x \to \infty}\left(x^{2} - 8 x + 15\right) = \infty$$ More at x→oo $$\lim_{x \to 0^-}\left(x^{2} - 8 x + 15\right) = 15$$ More at x→0 from the left $$\lim_{x \to 0^+}\left(x^{2} - 8 x + 15\right) = 15$$ More at x→0 from the right $$\lim_{x \to 1^-}\left(x^{2} - 8 x + 15\right) = 8$$ More at x→1 from the left $$\lim_{x \to 1^+}\left(x^{2} - 8 x + 15\right) = 8$$ More at x→1 from the right $$\lim_{x \to -\infty}\left(x^{2} - 8 x + 15\right) = \infty$$ More at x→-oo