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Mathematics 9 Online
OpenStudy (anonymous):

Factor this expression completely and then place the factors in the proper location on the grid. x2 - 9

jimthompson5910 (jim_thompson5910):

Rewrite 9 as 3^2 and then use the difference of squares factoring rule x^2 - 9 x^2 - 3^2 (x-3)(x+3)

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