The following article should provide the method you need to use.
http://sites.science.oregonstate.edu/math/home/programs/undergrad/CalculusQuestStudyGuides/ode/second/so_num/so_num.html
y''+5y'+6y=x, y(0)=1, x(0)=0, y'=1, h=0.2, then find y(0.2)?
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