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2. P(2,-1) Q(2,6) R(8,-1) S(3,-12)
3. (2x + 3)³ = 2x³ + 3(2x²)(3) + 3(2x . 3²) + 3³
= 2x³ + 18x² + 54x + 27
selisih kofisien suku ke2 & ke3 = 54 - 18 = 36