Question about SOA 120

[ibavly]

Not sure why I keep getting this wrong.

Solutions set up the integral from t/2->2 and 3->4

I set it up from 3->2x and 1.5->2

As far as I can tell the two are equivalent.

Other than that I did all the same things, so the only other possible mistake I could imagine would be in the algebra, which would make me feel dumb after triple checking.

So why doesn't this work

[Gandalf]

It seems like they should agree. You should post your work and maybe someone will be able to see what went wrong.

[ibavly]

Math on a computer always feels strange

int(1.5->2 int 3->2x(3x/8dt)dx) =
int(1.5->2 3xy/8(3->2x)dx) =
int(1.5->2 3x^2/4-9x/8 dx) =
x^3/4-9x^2/16 (1.5->2) =
2-2.25-.84375+1.265625 =
.171875

Completely perplexed as to how multiple times of doing this (including right before typing this) gave me the wrong answer.

lol me

[Gandalf]

:tup:

math on a computer is easier to read if you use tex http://www.actuarialoutpost.com/actuarial_discussion_forum/showthread.php?p=1409493#post1409493