Răspuns:
Explicație pas cu pas:
E(x)=4x²+12x+9-2(x²+2x-3)+(9-x²)-44=4x²+12x+9-2x²-4x+6+9-x²-44
=x²+8x+24-44=x²+8x-20
x²+8x-20=0
x1,2=-4±√16+20=-4±6 x1=-10 x2=2
E(2)=0⇒
E(2)E(3)E(4)...................E(2020)=0
