Divide a^4-b^4 by a-b.
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Step-by-step explanation:
a^4 - b^4/a - b =
(a^2 - b^2) (a^2 + b^2)/a - b =
(a^2 - b^2) (a + b) (a - b)/a - b =
(a^2 - b^2) (a + b) = a^3 + a^2b - ab^2 - b^3
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