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g(a)=5/9
maka
a^2-1=5/9
a^2=(5/9)+1
a^2=(5/9)+(9/9)
a^2=14/9
a=(+-)akar(14/9)=(akar14)/3
a=(akar14)/3 atau a=-(akar14)/3
untuk a=(akar14)/3
6a= 6[(akar14)/3]=2akar14
untuk a=-(akar14)/3
6a=6[-(akar14)/3]=-2akar14