$$\left(2a-1\right)\left(2a^2+a\right)-4a$$

$$\frac{d}{dx}\sqrt[3]{3x^2-2}$$

$$625=x^2$$

$$4a^2-81b^4$$

$$\int\frac{x^2-1}{x^4+5x^3+5x^2-5x-6}dx$$

$$3^2+3\left(3\right)\left(1\right)-\left(-4^2\right)$$

$$2x^2+13x-24=0$$