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2x-3=x² + bx +c
x² + (b-2) x + c+3 =0
(b-2)² -4 (c+3)=0 atau (b-2)² -4c -12=0
c= (b-2)²/4 - 12/4
y= x² + bx + (b-2)²/4 - 12/4