Posted by kathy on .
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?

Math 
Reiny,
how about
(2x+1)(2x+3)  4x^2 + 8x + 3 and
21x23 = 483 WOW!
let's try
(3x+2)(3x+4) = 9x^2 + 18x + 8 and
32x34 = 1088
mmmhhh!
008
180
900

1088