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-3a/-2=-4
-3a=-4x-2
-3a=8
a=-2,6
jadi nilai a adalah - 2,6
a^2-4a=8
a^2-4a-8=0
SPDV
rumus abc
x1,2= [4+-akar (16+32)]/2
x1,2=2+-(akar 48)/2
x1,2=2+- akar 12
x1= 2+akar 12
x2= 2-akar 12