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Jawaban : 3 ( 2x kuadrat -4x +5 ) + 2 ( 4x kuadrat +3x -7 )
= 6x kuadrat -12x +15 + 8x kuadrat +6x -14
= 6x kuadrat + 8x kuadrat -12x +6x +15 -14
= 14x kuadrat -6x +1