Euler's Method

We have $(x_0,y_0$ =(0,2)), and then: $\begin{aligned} (x_1,y_1)&=(0+1,2+1\cdot (0^2+0\cdot 2))=(1,2),\\ (x_2,y_2)&=(1+1,2+1\cdot (1^2+1\cdot 2))=(2,5),\\ (x_3,y_3)&=(2+1,5+1\cdot (2^2+2\cdot 5))=(3,19),\\ (x_4,y_4)&=(3+1,19+1\cdot (3^2+3\cdot 19))=(4,85), \end{aligned}$

so the answer is 85.