Math
posted by Help! on .
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 ?

(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)?