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Verified answer
2x²+4x-4=0a=2
b=4
c=-4
-b±√b²-4.a.c/2a
-(4)±√4²-4.(2).(-4)/2.(2)
-4±√16+32/4
-4±√48/4
-4±4√3/4 = 4(-1±√3)/4
-1±√3
-1+√3 atau -1-√3