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# Hars integration watch

1. Hard*

I can not do.

Find c in

c ∫ exp ( -(2x^2+3x+1)) dx =1, from -infinity to +infinity
2. (Original post by AlmostNotable)
Hard*

I can not do.

Find c in

c ∫ exp ( -(2x^2+3x+1)) dx =1, from -infinity to +infinity
substitution throws this I think into exp (-x2)
I can look at this later tonight or tomorrow morning
3. (Original post by TeeEm)
substitution throws this I think into exp (-x2)
I can look at this later tonight or tomorrow morning
Okay I will go back to figuring this can opener out. Real puzzle.
4. (Original post by AlmostNotable)
Okay I will go back to figuring this can opener out. Real puzzle.
It is done the way I suggested ...
5. (Original post by TeeEm)
It is done the way I suggested ...
I am currently doing Alevels.
6. Completing the square we have:

Let , then it's
7. (Original post by AlmostNotable)
I am currently doing Alevels.
where does the integral come from?
8. (Original post by TeeEm)
where does the integral come from?
The cyberspace.
9. (Original post by AlmostNotable)
The cyberspace.
here is my version, but this is beyond A level
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