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 Post subject: GMAT Algebra
PostPosted: Tue Nov 22, 2011 2:48 pm 
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Joined: Sun May 30, 2010 3:15 am
Posts: 424
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).
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The equation is incorrect. It should be 3x² + 18x + 27.


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 Post subject: Re: t.1, qt. 29: quadratic euqation
PostPosted: Tue Nov 22, 2011 2:51 pm 
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Joined: Sun May 30, 2010 2:23 am
Posts: 498
Quote:
It should be 3x² + 18x + 27.
That's exactly what it is.


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