Simpson's Rule Problem (1 Viewer)

[Menomaths]

http://imgur.com/ANQoYKv

For the previous questions I've been doing, they've all been 3,4 subintervals so when I calculate the ''h'' in the formula I take n-1, eg. S⁴₂ for 3 sub-intervals 4-2/2 = 1 and the answers always correct. But now I do this question with 2 subintervals and it all seems stuffed up!

 

[Drongoski]

For 2 sub-intervals, the formula for Simpson's becomes:


h/3 [1 x f1 + 4 x f2 + 1 x f3]

 

[Menomaths]

Oh right...Thanks

 

[Menomaths]

http://imgur.com/qgKAyZh

The correct answer in the book is exactly the same answer as the actual value.