$\lim_{x\to\infty}\left(\frac{4x^5}{e^x}\right)$
$1\left(5x-3y\right)-x+3x-5y$
$\frac{3x^2+4x+11}{x^2-3x+2}$
$x^2-9x-19=0$
$5x^2+24x+27$
$\frac{256b^2-196y^2}{16b+14y^4}$
$x^4+6x^2$
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