$2x^2+zy^3;\:x=1;\:y=3;\:z=2$
$a^4+a^2+1f$
$12x^2-12x+3$
$m^2-16n^2$
$-x^2+5x+6$
$9a^2-48ab+64b^2$
$x^2-x-6\ge0$
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