$(1/2-x)^2-(2x+1/2)^2$ differenza di quadrati

A cura di: Antonio Bernardo

$[(1/2-x)-(2x+1/2)][(1/2-x)+(2x+1/2)]$

$(1/2-x-2x-1/2)(1/2-x+2x+1/2)

$-3x(x+1)$