expand the following . ( a² b - ab²)².
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(a²b - ab²)²
using identity (x-y) ² x² -2xy + y²
x = a²b, y = ab²
(a²b - ab²) = a⁴b² - 2(a²b)(ab²) + a²b⁴
= a⁴b² - 2a³b³ + a²b⁴
= -2a³b³ +2a^6 +2b^6
= 2a³b³.
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