1.
Two distinct polynomials f(x)f(x) and g(x)g(x) are defined as f(x)=x2+ax+2f(x)=x^2+ax+2, g(x)=x2+2x+ag(x)=x^2+2x+a. If the equations f(x)=0f(x)=0 and g(x)=0g(x)=0 have a common root, then the sum of the roots of f(x)+g(x)=0f(x)+g(x)=0 is