$-4\sqrt[2]{5}-4\sqrt[2]{5}$
$3^2.3^7$
$\frac{3x^4-2x^2+8x+3}{x+1}+2x^2+4x-1$
$m^2+23m+49$
$4x^2-30x+45=0$
$x^2-2x+1\cdot x+1$
$9x^2-4x-\left(3x-2\right)^2$
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