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# C2 soloman paper B. integration with an infinate limity watch

1. (Original post by thefatone)

i integrated and got

then i put values in and got

[0]-[1.414]
so is -1.414 correct as an answer?
You've messed up your . The function is positive everywhere in the domain of integration; does a negative answer really make sense? You mean , not 1.414.
2. (Original post by Zacken)
You've messed up your . The function is positive everywhere in the domain of integration; does a negative answer really make sense? You mean , not 1.414.
better? i changed it

oh ... i just used my calculator but yes

so does that mean the area i got is below the x-axis?
3. (Original post by thefatone)
better? i changed it

oh ... i just used my calculator but yes

so does that mean the area i got is below the x-axis?
No, it means you integrated wrong.
4. (Original post by Zacken)
No, it means you integrated wrong.
aww s**t let's try again

so integrating

subbing infinity gives 0

subbing 2 in gives

so i get positive ????
5. (Original post by thefatone)
...
Where'd the negative in the denominator go?
6. (Original post by Zacken)
Where'd the negative in the denominator go?
oh.... lemme change that
7. (Original post by thefatone)
oh.... lemme change that
Okay, it's fine now. Now do your limits and remember the negative signs.
8. (Original post by Zacken)
Okay, it's fine now. Now do your limits and remember the negative signs.
all better? (editied)
9. (Original post by thefatone)
all better? (editied)
Yes.

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