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September 21, 2014

September 21, 2014

Posted by **Jenny** on Friday, May 3, 2013 at 3:40pm.

- math -
**Steve**, Friday, May 3, 2013 at 4:29pmsince a^2-b^2 = (a-b)(a+b)

a^2 = (a-b)(a+b)+b^2

75^2 = (75-5)(75+5)+5^2 = (70)(80)+25

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