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2x ´ (px + qy) + 3y ´ (px + qy) = rx2 + 23xy + 12y2
2px2 + 2qxy + 3pxy + 3qy2 = rx2 + 23xy + 12y2
(2p)x2 + (2q + 3p)xy + (3q)y2 = rx2 + 23xy + 12y2
r adalah 2p
=2px pangkat 2 +2qxy+3pxy +3qy pangkat 2 -23xy -12y pangkat 2 = r
x pangkat 2
maaf ya kalau salah