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a8 - b8 = ((a4)2 - (b4)2) [the difference of two squares]
= (a4 + b4)(a4 - b4)
= (a4 + b4)(a2 + b2)(a2 - b2)
= (a4 + b4)(a2 + b2)(a + b)(a -b)
(a^4)^2-(a^4)^2
(a^4+b^4) (a^4-b^4)
(a^4+b^4) (a^2)^2- (b^2)^2
(a^4+b^4). (a^2+b^2) (a^2-b^2)
(a^4+b^4). (a^2+b^2) (a+b) (a-b)
factor completely 6t^3 - 8t^2 - 30t
7(y + 4)
3 * x * x * y
(2p - 3)(2p + 1)
7x(3x3 - 2x2 + 5x + 1)