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Verified answer
1.(x-2) merupakan faktor maka f(2) =0
2³-4.2²+2+a=0
8 - 16 +2 + a =0
-6 + a = 0
a = 6
2.
-1 I 1 -2 -7 8 12
I -1 3 4 -12
---------------------- +
-2 I 1 -3 -4 12 0
I -2 10 -12
----------------- +
1 -5 6 0
(x+1)(x+2)(x²-5x+6)=0
(x+1)(x+2)(x-2)(x-3)=0
x=-1, x = -2, x = 2, x= 3
akar-akar -2,-1,2,3