$$3n+3=249$$

$$x+1<-5$$

$$\left(\sqrt{2}x+5\right)^2-\left(\sqrt{x}-\sqrt{2}\right)^2$$

$$\lim_{x\to\infty}\left(\sqrt{x^2+3}-x\right)$$

$$\int\left(x^2\cdot x\sqrt{x^2+1}\right)$$

$$176x=121+60x^2$$