Question 604295
use completing the square
 x^2+4x=y+1
 X^2+4x+4=y+1+4
 (x+2)^2=y+5
vertex=(-2,-5)
or use the following formula
 (-b/2a,((4ac-b^2)/4a)
 a=1,b=4,c=-1
(-b/2a,(4ac-b^2/4a)=(-4/(2x1),((4x1x(-1)-4^2)/(4x1))
=(-4/2,(-4-16)/4)=(-2,-20/4)=(-2,-5)