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rxs0005
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Value of x 20 Sep 2010, 12:45
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A
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0% (00:00) correct 100% (01:22) wrong based on 1 sessions

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If 3 + x / 1- x = x

what is the value of x^2

-3

-1

0

1

3



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A
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Gacarva
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Value of x Updated on: 20 Sep 2010, 18:58
Originally posted by Gacarva on 20 Sep 2010, 13:13.
Last edited by Gacarva on 20 Sep 2010, 18:58, edited 1 time in total.
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(3+x) / (1-x) = x

3+x = x - x^2

x^2 + x - x + 3 = 0

x^2 +3 = 0

x^2 = -3

Answer: A.............?
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Value of x 20 Sep 2010, 13:42
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rxs0005
If 3 + x / 1- x = x

what is the value of x^2

-3

-1

0

1

3
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ok, algebra is probably the best route for this prob since using plug in the answer the x^2 is kinda bad. This is one of those prob where it might take a bit longer if plugging
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Bunuel
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Value of x 20 Sep 2010, 13:57
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rxs0005
If 3 + x / 1- x = x

what is the value of x^2

-3

-1

0

1

3
Show more

First of all: rxs0005 please format the questions correctly.

If the question is indeed \(\frac{3 + x}{1- x}=x\) then \(3+x=x-x^2\) --> \(x^2=-3\), but such kind of equation CAN NOT occur on GMAT (square of a number can not equal to a negative number), remember GMAT is dealing only with Real Numbers: Integers, Fractions and Irrational Numbers.

Not a good question, so I wouldn't worry about it at all.

shaselai

ok, algebra is probably the best route for this prob since using plug in the answer the x^2 is kinda bad. This is one of those prob where it might take a bit longer if plugging
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I wonder what real number can you plug for \(x\) equation \(\frac{3 + x}{1- x}=x\) to hold true?
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Value of x 20 Sep 2010, 18:51
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I agree with Bunuel. Question was not formatted correctly. I tried using 3 + (x/(1-x)). Obviously I got incorrect equation



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