(adsbygoogle = window.adsbygoogle || []).push({}); 2 answers to same integral??!!

1. The problem statement, all variables and given/known data

Ive been giong mental over this. There seems to be two different answers to the same integral. I cant work out which is correct.

Integral from 0 to infinity of:

x(squared) exp(-2Bx(squared))

2. Relevant equations

What is the right answer?

3. The attempt at a solution

Integration by parts gives the answer as: -1/2B

My course lecturer gives the answer as: (1/8B) x route of (pie/2B)

I think she must have used the general formula:

Integral from -infinity to + infinity of x(power2n)exp(-Ax(squared)) = [1x3x5...(2n-1)]x(pie/A)/2(powern)A(powern)

and divided it by 2 as we only want the integral from 0 to infinity.

Whos right?? Can anyone work this out?

Please! write it down and see if you get the answer i did by integration by parts. If you do, do you think the lecturer is wrong?

Please help, i have an important exam tomorrow!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: 2 answers to same integral?

**Physics Forums | Science Articles, Homework Help, Discussion**