Question using the trapezoidal rule (1 Viewer)

[kloudsurfer]

Hey,

Im stuck on this question. I know how to do it, but I keep getting the answer wrong and I dont know why. Im sure I made an error somewhere but I cant seem to pick it up and its driving me crazy!

Heres the question: (i dunno how to write all the symbols on the computer)

"Use the trapezoidal rule to find an approximation for

b=5, a=1 (i cant draw the squiggly thingy), 1/x^2 dx using 4 subintervals"

After subing everything into the formula, I got:

= 1/2 [(1+0.04) + 2 (0.64 + 0.16 +0.071111...)]
= 1.39 (2dp)

But the answer is 0.94.

Im sure I have just made a silly mistake, so if anyone would be able to help it will be appreciated.

Thanks

 

[jyu]

Hey,

Im stuck on this question. I know how to do it, but I keep getting the answer wrong and I dont know why. Im sure I made an error somewhere but I cant seem to pick it up and its driving me crazy!

Heres the question: (i dunno how to write all the symbols on the computer)

"Use the trapezoidal rule to find an approximation for

b=5, a=1 (i cant draw the squiggly thingy), 1/x^2 dx using 4 subintervals"

After subing everything into the formula, I got:

= 1/2 [(1+0.04) + 2 (0.64 + 0.16 +0.071111...)]
= 1.39 (2dp)

But the answer is 0.94.

Im sure I have just made a silly mistake, so if anyone would be able to help it will be appreciated.

Thanks

Wrong substitutions

1/2 [(1+0.04) + 2 (1/4 + 1/9 + 1/16)]

:wave:

 

[kloudsurfer]

Wrong substitutions

1/2 [(1+0.04) + 2 (1/4 + 1/9 + 1/16)]

:wave:

Ahhhh! Thanks!!!!

I corrected an earlier mistake and forgot to change something else

Thankyou!!!!!!

 

[bos1234]

hello

If u wanna write the symbols, go to microsoft word
Insert > Object > equation (or equation editor)

It takes a bit of time getting used to

goodluck and goodnight

 

[kloudsurfer]

hello

If u wanna write the symbols, go to microsoft word
Insert > Object > equation (or equation editor)

It takes a bit of time getting used to

goodluck and goodnight

Mine doesnt have equation or equation editor