If y= x ​2 -2x-3, then if y=1, what's x?

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!