Polinomi 2

Es 182) 

D_12 = 2ab - 2b²

D_34 = 2ab

Quindi:

D_12 - D_34 = - 2b²

182)

$ [a^2-b^2-(a^2-2ab+b^2)]-[a^2+2ab+b^2-(a^2+b^2)]$ =

= $[a^2-b^2-a^2+2ab-b^2]-[a^2+2ab+b^2-a^2-b^2]$ =

= $-2b^2+2ab -2ab$ =

= $ -2b^2$