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Posted by **Boobear** on Friday, April 5, 2013 at 12:14pm.

9. 3x2 – 12

10. 5x3y + 35x2y + 45xy

- math -
**Reiny**, Friday, April 5, 2013 at 12:43pm3x^2 - 12

= 3(x^2 - 4)

continue, I see a difference of squares

5x^3 y + 35x^2 y + 45xy

I see a common factor os 5xy

= 5xy(x^2 + 7x + 9)

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