y=-½x+3에수직인직선이면,'기울기가2인직선,y=2x+k'인그래프에서y=-x²+4x-1에접해야하므로,-x²+4x-1=2x+k,x²-2x+k+1=0,판별식1-k-1=0일때이므로,k=0,∴y절편=0
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