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Curious Cubic Calculation? (Posted on 2004-10-13) Difficulty: 2 of 5
Show that α=√(7+5√2)+√(7-5√2) is an integer. No calculators or computers allowed!

See The Solution Submitted by Old Original Oskar!    
Rating: 3.8333 (6 votes)

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Solution Solution | Comment 2 of 14 |

See my next post for a translation of this gibberish.

From the equations (1+(2))=(7+5(2)) and (1-(2))=(7-5(2)), we deduce that = (1+(2)) + (1-(2)) = 2.

Edited on October 13, 2004, 1:35 pm
  Posted by David Shin on 2004-10-13 12:57:31

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