Posted by Austin on Thursday, March 1, 2012 at 9:11pm.
Any side of a triangle must be positive:
12-x>0
x<12
The sum of any two sides must be greater than the third. In this case,
12-x + 12 > 12+x
=>
24-x > 12 + x
=>
x < 6
Also,
12+12+x > 12-x
2x>-12
x>-6
Therefore the conditions are that
-6<x<6
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