$$\lim_{x \to \infty}\left(3 x^{\frac{2}{3}}\right) = \infty$$ $$\lim_{x \to 0^-}\left(3 x^{\frac{2}{3}}\right) = 0$$ More at x→0 from the left $$\lim_{x \to 0^+}\left(3 x^{\frac{2}{3}}\right) = 0$$ More at x→0 from the right $$\lim_{x \to 1^-}\left(3 x^{\frac{2}{3}}\right) = 3$$ More at x→1 from the left $$\lim_{x \to 1^+}\left(3 x^{\frac{2}{3}}\right) = 3$$ More at x→1 from the right $$\lim_{x \to -\infty}\left(3 x^{\frac{2}{3}}\right) = \infty \left(-1\right)^{\frac{2}{3}}$$ More at x→-oo