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trial and error
a³+6a²+12a+8=(-2)³+6(-2²)+12(-2)+8=0
maka salah satu faktornya adalah (a+2)
a=-2|1 6 12 8
|
------------ +
1 4 4 0
a²+4a+4=(a+2)(a+2)
faktornya: (a+2)(a+2)(a+2)