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a2 - b2 = (a - b)(a + b)
a2 - b2 = (a - b)(a + b)
a2 - b2 = (a + b)(a - b).
(a + b)(a - b) = a2 - b2 for example if a = 10 and b = 2 12 x 8 = 96 = 100 - 4
a^7 - b^7 = (a - b)(a^6 + a^5.b + a^4.b^2 + a^3.b^3 + a^2.b^4 +a.b^5 + b^6)