$$100x^2+220x+121$$

$$3m-7n+5m-7n+5n+3n$$

$$\frac{x-1}{4}+\frac{x+2}{5}<\frac{1}{2}$$

$$12x^2+25x-7$$

$$x^2dx=\left(y+1\right)dy$$

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

$$\frac{x^2+3\cdot x-2}{2\cdot x+2}$$