find (f+g)(x) if f(x)=3x+5 and g(x)=-2x^2-5x+3,
A. (f+g)(x)=-2x^2=8x=8
B.(f+g)(x)=-2x^2-2x+8
C.(f+g)(x)=-4x+8
D.(f+g)(x)=-2x+8