$18x^2+8x-9x^2+10$
$y^2+10y+4$
$\lim_{x\to0}\left(\frac{x+\sqrt{d+x}-\sqrt{d}}{x}\right)$
$5x^2;\:x=3$
$x^2-42x+441$
$4\:+\:7\:-\:18\::\:\left(-\:6\:\right)\:+\:42\::\:7\:-\:8$
$10x^2y-2x^2$
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