Answer:
[tex](x+3)^2=1[/tex]
Step-by-step explanation:
Complete the square:
[tex]x^2+6x+8=0[/tex]
[tex]x^2+6x+8+1=0+1[/tex]
[tex]x^2+6x+9=1[/tex]
[tex](x+3)^2=1[/tex]
Therefore, the equation rewritten in [tex](x-h)^2=k[/tex] form is [tex](x+3)^2=1[/tex]