Răspuns:
Explicație pas cu pas:
E(x) = (x+2)(x-3) - (2x-1)² + 3x(x+2)²
E(x) = x²-x-6 - 4x²+4x-1 + 3x(x²+4x+4)
E(x) = -3x²+3x-7+3x³+12x²+12x
E(x) = 3x³+9x²+15x-7
sau
E(x) = (x+2)(x-3) - (2x-1)² + 3(x+2)²
E(x) = x²-x-6-4x²+4x-1 + 3x²+12x+12
E(x) = 15x+5
E(x) = 5(3x+1)
