Jawabanmu

Jawaban paling cerdas!
2014-04-14T15:48:00+07:00
X² + (a-1)x + 2 = 0  >> a=1 , b=a-1 , c=2

α+β = -b/a = -(a-1) = -a+1
α.β = c/a = 2

α = 2β
α.β = 2
2β.β = 2
2β² = 2
β² = 1
β = +/-1   , maka α= +/- 2

α+β = -a+1
2+1 = -a +1
a= 1-3
a = -2  (tdk memenuhi) a<0

α+β = -a+1
-2 + (-1) = -a + 1
a = 1+ 3
a = 4 (memenuhi) a>0