SOLUTION: I have a value on absolute value equations! Why in some problems you get the same answer: for example x= 8 and x= -8, and in other problems you get two different answers: for examp

Question 359316: I have a value on absolute value equations! Why in some problems you get the same answer: for example x= 8 and x= -8, and in other problems you get two different answers: for example x= 3 and x= 7? Also, how do you know in which problems if you will get the same answer or if you will get different answers?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
Examples:
----------------------
X^2-9=0
(X+3)(X-3)=0
X+3=0
X=-3 ANS.
X-3=0
X=3 ANS.
---------------------
X^2+4X-21=0
(X+7)(X-3)=0
X+7=0
X=-7 ANS.
X-3=0
X=3 ANS.
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