Trapezoidal Rule? (1 Viewer)

[princessmess]

Help with Trapezoidal Rule anyone?

<I>
dx
_____

x + 3
</I>

from x = 1 to x = 2, using one subinterval?


Thanks in advance
-x-

 

[PC]

x f(x) W P
1.0 0.2500 1 0.2500
1.5 0.2222 2 0.4444
2.0 0.2000 1 0.2000
--------
0.8944

So Area = 1/2 x 0.5 x 0.8944 = 0.2236 (4 decimal places)

 

[williamc]

Help with Trapezoidal Rule anyone?


dx
_____

x + 3


from x = 1 to x = 2, using one subinterval?


Thanks in advance
-x-

Yer you rewrite the equation replacing the dx with a 1 so you get:

1
_
x+3 . dx

Then you use the rule 1/2(b-a)(f(a)+f(b))

1/2(2-1)(1/4+1/5)
1/2(1/4+1/5)
= (appoximation).... don't have calulator

 

[princessmess]

I can't thank you guys enough.

So much love