Dont know how to calculate apoapsis and perapsis

Does not know how to calculate this(i know that its based on a and e,but i dk them either)

Would not like answers with cross products(they dont work as well in 2d) or too many formulae(dont say that e=f(x,y,z),x=f(w,a,b),y=f(e,x,y) etc)

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