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 Post subject: GMAT Algebra
PostPosted: Wed Apr 10, 2013 2:00 am 
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Joined: Tue Apr 13, 2010 8:48 am
Posts: 483
If 3x² + 27 = -18x, what is x?
A. -9
B. -3
C. 0
D. 6
E. 9
(B) Look at the equation carefully. It is a quadratic equation, so it must be set equal to zero in order to solve for x. If we add 18x to both sides of the equation, we'll get:
3x² + 18x + 27 = 0.

We can now factor out a 3:
x² + 6x + 9 = 0.

This can be factored further:
(x + 3)(x + 3) = 0, so x = -3.

The correct answer is choice (B).
----------
The equation is incorrect. It should be 3x² + 18x + 27.


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 Post subject: Re: GMAT Algebra
PostPosted: Wed Apr 10, 2013 2:02 am 
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Joined: Fri Apr 09, 2010 2:11 pm
Posts: 459
Quote:
It should be 3x² + 18x + 27.
That's exactly what it is.


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