# P2 (edexcel) trapezium rule?

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17 years ago
#1
can sum1 help me out with the trapezium rule plz. i got a question which says a curve f(y)=2 Ln x is bounded by the positive coordinate axes and y=2. use trapezium rule with 4 intervals of equal width to work out the area under the graph.

does that mean i use values 0.5, 1, 1.5 and 2 or does it mean: 0, 0.5, 1, 1.5 and 2.

Any1 explain the trapezium rule (plz not that long formula its confusin!!) any good sites would b great help cheers!
0
17 years ago
#2
Hi

I would assume you go from zero because otherwise you are missing out part of the area.

As for the trapezium rule, with those values it would be:

Area = 0.5/2(0 + 2(0.5 + 1 + 1.5) + 2)

Hope that helps
Jacob
0
17 years ago
#3
You use the values 0, 0.5, 1, 1.5 and 2. These are the x-coordinates, and if you draw a diagram, you can see that there are 4 intervals.
0
17 years ago
#4
thanx guys that helped.
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