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June 30th, 2014, 04:17 PM  #1 
Newbie Joined: Jun 2014 From: Texas Posts: 2 Thanks: 0  Factor perfect square trinomials!! Helppp
1). X^2  10x + 25  y^2 2). X^2  18x + 81  y^2 
June 30th, 2014, 04:43 PM  #2 
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 407  Hello, Jazzy bell! There's a big hint in the title. I'll do the first one. $\quad x^2  10x + 25  y^2$ Note that the first three terms form a square. So we have: $\:(x5)^2  y^2$ Now we have the "difference of squares". $\qquad (x5  y)(x5 + y)$ Got it? 
June 30th, 2014, 05:29 PM  #3 
Newbie Joined: Jun 2014 From: Texas Posts: 2 Thanks: 0 
Yes I get it! Ok so would two go like this: x^2  18x + 81  y^2 (x9)^2  81 + 81  y^2= (x9)^2 y^2 =(x9y)(x9+y) Last edited by skipjack; July 1st, 2014 at 01:32 AM. 
June 30th, 2014, 08:22 PM  #4 
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 407  Hello, Jazzy bell! You got it! . . . Good work! 
July 16th, 2014, 02:18 AM  #5 
Member Joined: Jun 2014 From: Brighton Posts: 49 Thanks: 2  Very nice answer 

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factor, helppp, perfect, square, trinomials 
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