Tentukan himpunan penyelesaian dari SPLKK berikut:
y = x²-2x+1
y = -x²+2x-3
y = x²-2x+1
y = -x²+2x-3
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y=y
x²-2x+1=-x²+2x-3. Pindah ruas
=x²+x²-2x-2x+1+3
=2x²-4x+4 bagi 2
=x²-2x+2
D=b²-4ac
=-2²-4.1.2
=4-8
=-4