Which of these is the general solution of y′=2x+1y' = 2x + 1y′=2x+1?
y=x2+x+Cy = x^2 + x + Cy=x2+x+C
y=x2+Cy = x^2 + Cy=x2+C
y=2x2+x+Cy = 2x^2 + x + Cy=2x2+x+C
y=x2+1+Cy = x^2 + 1 + Cy=x2+1+C