Please help explaining this example. I will appreciate clearwritten or typed explanation .Thank you.

Solve the following ODE'S (Ordinary differential Equation) problem by using FEM (Forward Euler Method), MEM (Modify Euler Method), & RK2 (Runge-Kutta Method) and compare the results vs the exact solution. y' = -2y2 + e-2t, y(0) = 1 E = 0.01