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y = x + c
y = y
x² - 3x + 5 = x + c
x² - 3x - x + 5 - c = 0
x² - 4x + 5 - c = 0
a = 1, b = -4, c = (5 - c)
syarat tidak punya penyelesaian
D < 0
b² - 4ac < 0
(-4)³ - 4.1.(5 - c) < 0
16 - 20 + 4c < 0
4 + 4c < 0
4c < -4
c < -1