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(a + b)² = a² + 2ab + b²
Ganti b menjadi 3y dan a
(3y + )² = (3y)²+ 2(a)(3y) + a²
(3y + )² = 9y² + 6ay + a²
Karena 6ay = 24y , maka :
6ay = 24y
a = 24y : 6y
a = 4
Maka :
(3y + 4)² = 9y² + 24y + 16