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= 2x² - 8xy + 3xy -12y²
= 2x² - 11 xy -12y²
2× kuadrat - 8xy + 3xy - 12y kuadrat
2x kuadrat - 5xy - 12 y kuadrat
jadi hasilnya adalah 2x kuadrat - 12y kuadrat - 5xy .
semoga bermanfaat :)