$$x^2-20x=51$$

$$\left(7x^3+4y^2\right)\left(7x^3-4y^2\right)$$

$$4tan\left(x\right)sin\left(x\right)$$

$$2-4u+8u$$

$$\int\frac{\sqrt{x^{\frac{1}{3}}-1}}{x^{\frac{1}{3}}}dx$$

$$\left(5m^5+3n\right)\left(5m^2-3n\right)$$

$$3x^2-12x=\left(x-2\right)\left(x+2\right)$$