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May 20th, 2015, 03:07 AM  #11 
Member Joined: Jan 2015 From: Norway Posts: 95 Thanks: 1  
May 20th, 2015, 07:27 PM  #12 
Senior Member Joined: Nov 2010 From: Indonesia Posts: 2,001 Thanks: 132 Math Focus: Trigonometry 
It's because $\displaystyle x^2a^2 = (x+a)(xa)$, thus: $\displaystyle x^2121 = x^211^2 = (x+11)(x11)$ and $\displaystyle x^2144 = x^212^2 = (x+12)(x12)$ 

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