How can I solve this differential equation? How can I find a solution of the following differential equation:
$$\frac{d^2y}{dx^2} =\exp(x^2+ x)$$
Thanks!

$$\frac{d^2y}{dx^2}=f(x)$$
Integrating both sides with respect to x, we have 
$$\frac{dy}{dx}=\int f(x)~dx+A=\phi(x)+A$$
Integrating again 
$$y=\int \phi(x)~dx+Ax+B=\chi(x)+Ax+B$$
