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a? - b2 = (a + b)(a - b)9x2 -- 25y2 = (3x + 5y)(3x - 5y)(a + b)2 -- 25 = [(a + b) + 5][(a + b)-5) = (a -

a? - b2 = (a + b)(a - b)9x2 -- 25y2 = (3x + 5y)(3x - 5y)(a + b)2 -- 25 = [(a + b) + 5][(a + b)-5) = (a -

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