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=5x × 4x + (-7)×4x + 5x × 2 + (-7)×2
=9x² + (-28x) + 10x + (-14)
=9x² + (-18x) + (-14)
maaf kalo salah
(5x × 4x) + (5x × 2) - (7 × 4x) - (7 × 2)
maka
semoga membantu maaf kalau ada yang kurang atau salah