Which of the following is always equal to √(9 + x^2 -6x) ?

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Deleting this post as i have submitted it twice.

****my apologies.My stupid internet is too slow that i clicked the submit button twice to confirm whether it is posted or not.********

Vinni
Last edited by vinni.k on Sat Jan 11, 2014 8:02 pm, edited 3 times in total.
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by theCodeToGMAT » Sat Jan 11, 2014 7:51 pm