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a) suku ke 4 = 12c3 (x²)⁹(-2x⁻¹)³
U4 = 220 (x¹⁸) (-2)³ (x⁻¹)³
U4= 220(-8)(x¹⁸)(x⁻³)
U4 = - 220 (8) x¹⁵
b) koefisien x⁶ =
U7 = 12c6 (x²)⁶(-2x⁻¹)⁶
U7 = 924 x¹².x⁻⁶. (-2)⁶
U7 = (924(64)(x⁶)
Koef x⁶ = 59.136