Answer :

[tex]\begin{gathered} y=x^2-2x \\ (a,3) \\ 3=x^2-2x \\ x^2-2x-3=0 \\ x^2+x-3x-3=0 \\ x(x+1)-3(x+1)=0 \\ (x-3)(x+1)=0 \\ x=3\text{ or } \\ x=-1 \end{gathered}[/tex]

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