$$6-5x-4x^2$$

$$\frac{\left(x^{10}+x^7+x^6+x^5+x^3\right)}{x+1}$$

$$x^3+18x^2+81x$$

$$2x^{\frac{1}{2}}+6x^{-3}$$

$$\lim_{m\to1}\left(\frac{3m^2-3}{m-1}\right)$$

$$m^2+12m=36$$

$$\frac{d}{dx}\left(5x^2y+9y^2x=-3\right)$$