y=x2−2x−3
x2 −2x−3=y
−2x−3=y−x 2
−2x=y−x2+3
−2x/-2=y-x2+3/-2
x=−y-x2+3/-2
x= y+x2-3/2
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y=x2−2x−3
x2 −2x−3=y
−2x−3=y−x 2
−2x=y−x2+3
−2x/-2=y-x2+3/-2
x=−y-x2+3/-2
x= y+x2-3/2