Answer:
[tex]x^{2}=-y^2-2y+19[/tex]
Step-by-step explanation:
we have
[tex]x^{2} +(y+1)^2=20[/tex]
Isolate the variable x^2
Subtract (y+1)^2 both sides
[tex]x^{2}=20-(y+1)^2[/tex]
[tex]x^{2}=20-(y^2+2y+1)[/tex]
[tex]x^{2}=20-y^2-2y-1[/tex]
[tex]x^{2}=-y^2-2y+19[/tex]
