$\int\left(21x^2\right)dx$
$u^2+4u\ge21$
$3x>21$
$+x^2-9x+1+3x^2-4x+6-8x^2+3x-4$
$\int\frac{9x^4+5x^2+3}{x^2}dx$
$890-523-35$
$m=\left(x+4\right)\left(x+2\right)-\left(x-4\right)\left(x-2\right)$
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