Jawabanmu

2014-04-14T19:24:50+07:00
 \alpha + \beta  =  \frac{-4}{a-2}
 \alpha  \beta = \frac{a+2}{a-2}
 \alpha  \beta ^{2} +   \beta  \alpha ^{2} = -20
 \alpha  \beta ( \beta + \alpha ) = -20

jabarkan sendiri, jawaban:
 \alpha =  \frac{6}{5} atau  \frac{3}{5}


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