$f\left(x\right)=\frac{8}{x^4}+9\sqrt{x}-2\sqrt[4]{x^5}-6$
$x ^ { 2 } + 6 x y + 9 y ^ { 2 }$
$x^2+2x=5$
$x^{2-49}$
$5x^2-13x-28$
$\lim_{x\to\infty}\left(x^2+1\right)^{\frac{1}{3+lnx}}$
$\left(\sqrt{x+5}-4\right)\left(\sqrt{x+5}+4\right)$
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