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2px^2 + (3p+2q)xy + 3qy^2 = rx^2 + 23xy + 12y^2
identikkan ruas kiri dan kanan maka berlaku :
3q = 12
q = 12/3 = 4
3p + 2q = 23
3p + 2(4) = 23
3p + 8 = 23
3p = 23 - 8
3p = 15
p = 15/3 = 5
r = 2p
r = 2(5)
r = 10