perplexus.info :: Numbers : Curious Cubic Calculation?

Curious Cubic Calculation? (Posted on 2004-10-13)

Show that α=ł√(7+5√2)+ł√(7-5√2) is an integer. No calculators or computers allowed!

Submitted by Old Original Oskar!

Rating: 3.8333 (6 votes)

Solution: (Hide)

Please see http://www.math.purdue.edu/pow/fall2002/pdf/solution08.pdf

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Solution	K Sengupta	2007-05-16 11:16:02
re: Full Solution	Rhys	2004-10-17 03:51:42
re: inegrity by squaring REVISITED	Ady TZIDON	2004-10-15 06:14:32
re(2): Solution	Nosher	2004-10-14 02:02:19
re: Algebraically	Federico Kereki	2004-10-14 01:00:24
Algebraically	e.g.	2004-10-13 16:24:58
re: Answer + Solution	Jer	2004-10-13 16:13:16
I way I see it	Jer	2004-10-13 16:03:57
Answer + Solution	nikki	2004-10-13 13:38:20
re: Solution	David Shin	2004-10-13 13:33:30
Full Solution	Brian Smith	2004-10-13 13:06:00
re: Solution	e.g.	2004-10-13 12:59:16
Solution	David Shin	2004-10-13 12:57:31
inegrity by squaring	Ady TZIDON	2004-10-13 12:49:02

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