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akar2nya x11 dan x21
x11+x21= -b/a= -2
x11.x21=c/a = -3a
x^2+3x-2a=0
akar2nya x21 dan x22
x21+x22=-b/a=-3
x21.x22=c/a=-2a
x11=2. x21
x21=x11/2
x11+x11/2 =-2
3/2 x11=-2
x11= -4/3
x21=x11/2 = -4/3 /2 = -2/3
x21+x22=-3
-2/3 +x22=-3
x22= -3+2/3
=-7/3
x21.x22=-2a
-2/3 . -7/3 = 2a
14/3 = 2a
a= 7/3