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= 20x2 -16xy -15xy +12y2
= 20x2 + 12y2 - 31xy
Pertama, 4x dikali dengan (5x-4y)
Kedua (-3y) dikali dengan (5x-4y)
Gabungkanlah kedua langkah tersebut
(4x-3y)(5x-4y) = 20x²-16xy-15xy+12y²
= 20x²-31xy+12y²