$3x^4+x^2-4x$
$19.3\left(1.089\right)^{23.1}$
$\sqrt[3]{27}-5\sqrt[3]{8}$
$1.5^{\frac{3}{2}}$
$\left(u-\frac{1}{2}\right)^2$
$\frac{1+x^{2}}{1-x+x}=\frac{1+x}{1}+\frac{x^{2}}{1-x^{2}}$
$6x^2+6x+2-\left(2x-1\right)^2$
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