[HP-PRIME CAS] inequations CompSystems Member Posts: 213 Threads: 60 Joined: Mar 2013 11-02-2013, 10:05 PM see screenshot at the end of the next picture solve((ABS(ABS(2*x+1)-5))>2,x); [ENTER] => { -4>x,x>-2 AND 1>x,x>3} Han Senior Member Posts: 709 Threads: 104 Joined: Nov 2005 11-02-2013, 10:26 PM Both the HP Prime and the TI nSpire produce correct answers. They just return slightly different representations of the same solution. x>-2 AND x<1 means the same as -2-2 AND x<1) == (-2 0 // BUG? Edited: 2 Nov 2013, 11:03 p.m. after one or more responses were posted Han Senior Member Posts: 709 Threads: 104 Joined: Nov 2005 11-02-2013, 11:00 PM The inequality > and < have higher priority than AND. So x>-2 AND x<1 is actually (x-2) AND (x<1) … not to be confused with x> (-2 and x) < 1 -- which would not make much sense. Also, the result returns a symbolic object which embeds AND -- which is very different from a result which evaluates binary operation. « Next Oldest | Next Newest »

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