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(2x+3y)(px+qy)=rx²+23xy+12Y²
2p x² +3p xy + 2q xy + 3q y² = r x + 23 xy + 12 y²
2p x² +(3p + 2q) xy + 3q y² = r x + 23 xy + 12 y²
kita mulai saja dari koefisien y²
koefisien suku kiri suku kanan
y² 3q = 12 .......... q =3
xy 3p+ 2q = 23 ........ 3p + 2 , 3 =23 ....... p = 17/3
x² 2p = r ............ r= 2 , 17/3 = 34/3 = 11 1/3
2px^2 + 2qxy + 3pxy + 3qy^2 = rx^2 + 23xy + 12y
2px^2 + (2q + 3p) xy + 3qy^2 + rx^2 + 23xy + 12y
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3q = 12
q = 12/3 ( 12 per 3 )
q = 4
( 2q + 3p ) = 23
2(4) + 3p = 23
8 + 3p = 23
3p = 23-8
3p = 15
p = 5
sehingga untuk nilai R
2p = r
2(5) = r
10 = r