$x^2-30+196$
$\frac{d}{dx}\:y^{4\:}-2x^2+\:8xy^2+9\:=0$
$\left(x+2y\:+1\right)^2$
$1=x^2+16$
$\lim_{x\to\infty}\left(\frac{6x}{\sqrt{4x^2+5}}\right)$
$\frac{1}{9}=\frac{11}{x}$
$x^4-x^3-6x^2$
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