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January 25, 2015

January 25, 2015

Posted by **olivia** on Monday, June 14, 2010 at 5:59pm.

- 9th grade -
**Reiny**, Monday, June 14, 2010 at 6:18pmyou could group it, then factor

ac-bc-ad+bd

= c(a-b) - d(a-b)

= (a-b)(c-d)

check it by expanding my answer.

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