$$3x^2+27<0$$

$$12x-7\left(1n+5\right)-8\left(1x+8n\right)$$

$$\lim_{x\to1}\left(\frac{e^{4x}}{x^4}\right)$$

$$2x^2-12x+2-16y$$

$$\left(\left(x+y\right)-3\right)\:\left(\left(x+y\right)+3\right)$$

$$y=\ln\left|2x+3\right|+\ln x^x$$

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