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= (2x + 5y)(2x + 5y)
= 4x² + 10xy + 10xy + 25y²
= 4x² + 20xy + 25y²
Semoga membantu mu,,maaf jika ada yg salah hitung dapat di cek kembali
=4x²-10xy-10xy-25y²
=4x²-20xy-25y²