Posted by Help! on Friday, August 31, 2012 at 1:25am.
I'm suppose to 'determine whether the equation is an identity or a conditional equation.
A) 6(x3)+5 = 2x+10
I solved this and got x = 13/4. How am I suppose to figure out whether its identity or conditional equation?
Same goes with this problem
B) 7(x3)+4x = 3(7x)
7x+21+4x = 213x
213x = 21 3x ?

Math  MathMate, Friday, August 31, 2012 at 11:19am
(A)
x=13/4 means that the equation is valid only at x=13/4, and is not valid elsewhere.
Would that be an identity or a conditional equation?
(B)
There was an arithmetical error on the last line:
7x+21+4x = 213x
+213x = 21 3x
So after cancelling, we get
21=21
Would that be a conditional equation or an identity (i.e. true for all values of x)?
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