$x^4-10x^4\:+25$
$81x^2-18x+1$
$x^4+2x^3-3x^2-8x-4$
$\left(5^4-5^2\right)$
$\lim_{x\to1}\left(\frac{2-\sqrt{26}-x}{x-1}\right)$
$5.5x^2+44x-160$
$\left(-5\right)\left(3\right)\left(-4\right)\left(10\right)$
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