I think I correctly attached the screenshot, if not, here's the problem:
Is it true that x>0?
(1) x^2=2x
(2) x^3=3x
for statement 1:
x(x-2) = 0
therefore, x = 0, 2 ---- INSUFFICIENT
statement 2:
x(x^2-3)=0 (THIS IS WHERE GMAT FOCUS IS WRONG -- they have, x^2(x-3) -- this factored would be x^3-3x^2 = 0, WRONG)
I obviously could be wrong, but from statement 2 I conclude that x = 0 or is a positive number --- INSUFFICIENT
COMBINING 1+2 =
x^2=2x
x^3=3x
I multiplied statement 1 by x, getting -- x^3=2x^2
Now, I substituted x^3 from statement 2.
3x = 2x^2
Then I did this:
3x-2x^2=0
x(3-2x)=0
x=0
x=3/2
ANSWER E -- GMATFOCUS says Answer C
What say you Beatthegmat??
Is it true that x>0?
(1) x^2=2x
(2) x^3=3x
for statement 1:
x(x-2) = 0
therefore, x = 0, 2 ---- INSUFFICIENT
statement 2:
x(x^2-3)=0 (THIS IS WHERE GMAT FOCUS IS WRONG -- they have, x^2(x-3) -- this factored would be x^3-3x^2 = 0, WRONG)
I obviously could be wrong, but from statement 2 I conclude that x = 0 or is a positive number --- INSUFFICIENT
COMBINING 1+2 =
x^2=2x
x^3=3x
I multiplied statement 1 by x, getting -- x^3=2x^2
Now, I substituted x^3 from statement 2.
3x = 2x^2
Then I did this:
3x-2x^2=0
x(3-2x)=0
x=0
x=3/2
ANSWER E -- GMATFOCUS says Answer C
What say you Beatthegmat??
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