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AIME #7 1995
Posted:
Thu Jul 12, 2007 9:51 pm
by stupidityismygam
Given that [unparseable or potentially dangerous latex formula] and [unparseable or potentially dangerous latex formula] where [unparseable or potentially dangerous latex formula] and [unparseable or potentially dangerous latex formula] are positive integers with [unparseable or potentially dangerous latex formula] and [unparseable or potentially dangerous latex formula] relatively prime, find [unparseable or potentially dangerous latex formula]
Posted:
Thu Jul 12, 2007 10:52 pm
by Roel
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
After moving things to one side and multiplying everything by [unparseable or potentially dangerous latex formula]:
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
Quadratic formula:
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
Since our answer needs to be [unparseable or potentially dangerous latex formula]:
[unparseable or potentially dangerous latex formula]
Back to [unparseable or potentially dangerous latex formula]:
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
From earlier equations we have:
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
Substituting:
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
Posted:
Thu Jul 12, 2007 11:02 pm
by stupidityismygam
Let [unparseable or potentially dangerous latex formula]
Multiply the first by the second to give [unparseable or potentially dangerous latex formula] Multiply this by 4, [unparseable or potentially dangerous latex formula]
Add the beginning equations together to give [unparseable or potentially dangerous latex formula]. Square this [unparseable or potentially dangerous latex formula]
So this means that [unparseable or potentially dangerous latex formula]
Find the zeros and you win.