The end of the world cometh - 4 boney dudes on horseback spottedby Daily Mail readers...
On 06/06/2015 11:15, tim..... wrote:
"Tim Streater" wrote in message
.. .
In article , Tim Watts
wrote:
Prove that: n^2-n-90=0
For n = -9 or n = 10, easy enough to do in one's head.
That's a solution
not a proof
tim
Correct, it is not a proof - neither was my answer earlier.
This is, though: 6/n x 5/n-1 = 1/3
-- 30/n^2-n = 1/3
-- 90 = n^2-n -- 0 = n^2-n-90
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