6.1.5-Numerical Integration: Newton-Cotes Integration Formulas

[@detroitlions1114]

for n=3 under the simplified newton cotes formula, you forget the the 3's multiplying f(x1) and f(x2)

[@naufalhanif275]

for simpson's 1/3 rule (b-a)/8*[f(x0)+3f(x1)+3f(x2)+f(x3)]

[@segoviapatricio]

what about the error terms within the original formula? you didn't include them and how to use them?