How do you use the improved Euler's method subroutine with step size h=0.2 to approximate the solution to the initial value problem:

y'= (1/x)(y^2+y)

at points x= 1.2, 1.4, 1.6, 1.8 and N=4

My book shows the "improved" method just like the original and I want to see an example and know how it is improved or different from the original.