$$\lim_{x\to\infty}\left(-5x^3-5x\right)$$

$$10r^2f+9f^2-30r^2f-11f^2$$

$$25x^4-10x^2y^4+y^8$$

$$-\frac{x}{4}+x$$

$$\left(-\frac{2}{5}h-7\right)\left(\frac{2}{5}h+7\right)$$

$$\int\frac{\left(3\sqrt{x}-2x^4\right)}{\sqrt[7]{x}}dx$$

$$\left(11sy^2z^5+2s^7k^9\right)^2$$