actually i was going to go, but then i saw your question so thought to answer it ,

now , \(y=x^2 -2x - 3 \)

now y is also eqal to 1 so

\(y=1\)

if we quate both of them then,

\(1=x^2 -2x -3 \)

Take 1 to the other side

\(x^2 -2x-3-1=0\)

\(x^2 - 2x- 4 = 0\)

now it has turned into a simple quadratic equation that you can solve either by factirisation or by the quadratic formula!