a) 1/2 x - (-4x²) = - 2x³
-2x³ * 3x = - 6x4
1/2x * - 12x³
b) -2ab² * 4a²b = -8 a³b³
-8 a³b³ * (-ab²) = 8a4b5
-2ab² * - 4a³b³= 8a4b5
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a) 1/2 x - (-4x²) = - 2x³
-2x³ * 3x = - 6x4
1/2x * - 12x³
b) -2ab² * 4a²b = -8 a³b³
-8 a³b³ * (-ab²) = 8a4b5
-2ab² * - 4a³b³= 8a4b5