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October 1st, 2011, 01:10 PM  #1 
Newbie Joined: May 2011 Posts: 3 Thanks: 0  Positive Exponents
Write with only positive exponents. (3x^2 y) (2x^2 y) I got 6x^2 y^2 But the teacher got 6y^2 I don't understand how he got that Thanks. 
October 1st, 2011, 01:33 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,155 Thanks: 462 Math Focus: Calculus/ODEs  Re: Positive Exponents
We are given: to write using only positive exponents. Multiplying coefficients and like bases, there results: You incorrectly added exponents on the x terms and got 2 instead of 2  2 = 0. This term then becomes 1 and need not be written via the multiplicative identity property, i.e.: edit: You also have rewritten the original expression as: The factor in both numerator and denominator divide out, leaving: 

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