Posted by Manny on Friday, February 13, 2009 at 7:23pm.
Hi:
I was wondering how I would even start to solve a problem like this.
Solve for x1, x2, x3, and x4:
x1x2+x1+x2=524
x2x3+x2+x3=146
x3x4+x3+x4=104
Thanks,
Manny

nonlinear coupled equations  needs better mathematician than I am  Damon, Friday, February 13, 2009 at 8:34pm
I took a crack at it but did not get far.

Math  Reiny, Friday, February 13, 2009 at 11:27pm
I also have spent an unreasonable amount of time trying it.
I even went so far as to run an oldfashioned 1970ish BASIC program
10 FOR A = 25 TO 35
20 FOR B = 25 TO 35
30 FOR C = 25 TO 35
40 FOR D = 25 TO 35
50 IF ((A*B+A+B=514) AND (B*C+B+C=146) AND (C*D+C+D=104)) THEN PRINT A,B,C,D
60 NEXT D
70 NEXT C
80 NEXT B
90 NEXT A
It found no integer solutions to your problem in the domain from 25 to + 35
I used A,B,C, and D for your variables
X1,X2,....
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