# Double Intergral with Substitution

 Mentor P: 11,837 3:30 in which time zone? ;) Here at me, you asked your question at 5:09 PM. Converted in a format that is easier to read: $$\int_0^4 \left(\int_{x/2}^2 e^{y^2} dy\right)dx$$ Did you draw a sketch of the integration area (in the x,y-plane)? The integral is equivalent to $$\int_0^2 \left(\int_{0}^{2y} e^{y^2} dx\right)dy$$ There, both integrals are easy to evaluate in that order.