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4x^2 - 4x + 16 = 0 (dibagi)
x^2 - x + 4 = 0
(gk ada faktornya) klo pake rumus a,b,c =
x1,2= (-(-1) ± √(-1)^2 - 4.1.4) : 2.1
= (1 ± √1-16) : 2
= (1 ± √-15) : 2
kan gk ada √-15
Jadi, HP-nya gk ada