Two distinct polynomials f(x) and g(x...

Two distinct polynomials f(x) and g(x) defined as defined as follow :
`f(x) =x^(2) +ax+2,g(x) =x^(2) +2x+a`
if the equations f(x) =0 and g(x) =0 have a common root then the sum of roots of the equation f(x) +g(x) =0 is -

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