Is it true that x>0
a. x^2 = 2x
b. x^3 = 3x
Can someone please explain. I was not convinced with the answer.
a. x^2 = 2x
b. x^3 = 3x
Can someone please explain. I was not convinced with the answer.
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Gmat Prep DS question
Source: Beat The GMAT — Data Sufficiency |
I'll go with B.
Statement 1 is unsufficient, since X could be 0 or 2..
Statement 2 is sufficient because the only possible solution is 0
Statement 1 is unsufficient, since X could be 0 or 2..
Statement 2 is sufficient because the only possible solution is 0
from (1) - x^2=2x -> x = 0 or 2
from (2) - x^3=3x -> x = 0 or + or - sq.rt(3)
either 1 or 2 not sufficient alone but from 1 and 2 x = 0 satisfies both. hence, x is not > 0.
from (2) - x^3=3x -> x = 0 or + or - sq.rt(3)
either 1 or 2 not sufficient alone but from 1 and 2 x = 0 satisfies both. hence, x is not > 0.
