Posted by **kathy** on Thursday, February 26, 2009 at 10:05pm.

1. (x+1)(x+1)=x^2+x+x+1=x^2+2x+1

11*11=121

2. (x+1)(x+2)=x^2+2x+x+2=x^2+3x+3

11*12=132

3. (x+1)(x+3)=x^2+3x+x+3=x^2+4x+3

11*13=143

What are the similarities between the two answers in each pair of products?

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