$7 x ^ { 2 } + x 4 - y ^ { 2 } = 4$
$4x^4-20x^2y+25y^2$
$\lim_{x\to3}\left(\frac{4x^2-36}{x^2+9}\right)$
$\left(x+5\right)^2\left(x+7\right)^2$
$-\:4x^2\:+\:8\:=\:0$
$\left(2a^8b^5c^6\right)-\left(16a^4b^4c^5\right)$
$5m+10\le130$
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