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2p xkuadrat + 5 qxy + 3 q ykuadrat = r xkuadrat +23 xy +12 y kuadrat
2p + 8 q = r + 35
2p + 8 q -35 = r
rx^2+23xy+12y^2=2px^2+(2q+3p)xy+3qy^2
Smakan koefisien dgn indeks yg sma:
12=3q maka q=12/3=4
2q+3p=23
2•4+3p=23
3p=23-8=15
Maka p=15/3=5
r=2p=2•5=10