Răspuns:
Explicație pas cu pas:
x^2 + 4x + 3 = (x + 3)(x + 1)
x^2 + 3x + 2 = (x + 1)(x + 2)
x^2 + 5x + 6 = (x + 2)(x + 3)
E(x) = (x + 3)(x + 1)(x + 1)(x + 2)/(x + 2)(x + 3) = (x + 1)(x + 1) = (x + 1)^2 patrat perfect, deci ≥ 0 in conditiile date.
