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Posted by **sherri** on Thursday, December 11, 2008 at 2:12pm.

9-x^2

4x^2+81-36

4y2^+16y+16

x2^-25/x+5

- Math -
**Writeacher**, Thursday, December 11, 2008 at 2:32pmassistance needed

- school work -
**sherri**, Thursday, December 11, 2008 at 2:40pmi need assistance yes

- school work -
**Anonymous**, Thursday, December 11, 2008 at 5:40pmwhat do u need help on

- school work -
- school work -
**Reiny**, Thursday, December 11, 2008 at 3:28pmhints

first one is a basic example of "difference of squares"

second does not factor

third is a perfect square, (2y+4)^2

the last one, factor the top as a difference of squares, then cancel one of those factors with the denominator.

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