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Verified answer
Bab Persamaan KuadratMatematika SMP Kelas VIII
4 (3x + 5y)²
= 4 ((3x)² + 2 . 3x . 5y + (5y)²)
= 4 (9x² + 30xy + 25y²)
= 36x² + 120xy + 100y²