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y=y
x²-4x+5 = 2x+a
x²-4x+5-2x-a = 0
x²-6x+5-a = 0
syarat
D ≥ 0
b²-4ac ≥ 0
36-4(1)(5-a) ≥ 0
36-20+4a ≥ 0
16 + 4a ≥ 0
4a ≥ -16
a ≥ -4