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2px² + 18xy + 3pxy + 27y² = rx² + 23xy + 12y²
2px² + ( 18 + 3p ) xy + 27y² = rx² + 23xy + 12y²
Ambil nilai koefisien xy :
18 + 3p = 23
3p = 23 - 18
3p = 5
p = 5/3
Ambil koefisien x² :
2p = r
r = 2 × 5/3
r = 10/3
Sehingga, nilai :
p = 5/3
r = 10/3