Finding the general solution of higher order differential equation y '"= 2x + e ^ x

Finding the general solution of higher order differential equation y '"= 2x + e ^ x

y'''=2x+e^x
y''=x^2+e^x+A
y'=1/3*x^3+e^x+Ax+B
Y = 1 / 12 * x ^ 4 + e ^ x + A / 2 * x ^ 2 + BX + C (a, B, C are arbitrary constants respectively)