Question

E(x)=(x+1)*+(2x+1)*+(1-x)(2x-1)-3(3x-1)-4
arata ca e(x) =3x* pt ori ce nr real x

Answer 1

E(x) = (x+1)² +(2x+1)²+(1-x)(2x-1)-3(3x-1)-4

E(x) = x²+2x+1 +4x²+4x+1 +2x-1-2x²+x-9x+3-4

E(x) = 3x²+0+0

E(x) = 3x² oricare ar fi x nr real