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2x²-4x+5 = 0
2x²-4x = -5
x² - 2x + 1 = -5/2 +1
(x-1)² = -3/2
√(x-1)² = √-3/2
x-1 = +- √-3/2
x 1 = 1+ √-3/2
x 2 = 1 - √-3/2
itu x nya tinggal dimasukin ke soal,
moga aja bener..