$\lim_{x\to\infty}\left(\frac{4x^4+4x^2+1}{x^2-2x-1+x^2+x}\right)$
$x^2=-18-9x$
$x^2-5x-4\ge0$
$\lim_{x\to\infty}\left(\frac{17x}{17x+2}\right)^{9x}$
$2x^3-5x^2+x+1\:y=2$
$18x^5+3x^4$
$1.6458+4.6458$
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