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(8+4x-2x-x^2)=0
-x^2+2x+8=0 (kedua ruas dikalikan (-) )
x^2-2x-8=0
(x-4 ) (x +2 )=0
jadi x-4=0 dan x+2=0
x=4 dan x=-2
HP {x| x=4 dan x=-2}