Answer:
Step-by-step explanation:
We'll first use
[tex]y=(x-h)^2+k[/tex] being given the vertex and then we'll FOIL to standard form.
h = -3 and k = -7
[tex]y=(x+3)^2-7[/tex] and
[tex]y=(x+3)(x+3)-7[/tex] and
[tex]y=x^2+6x+9-7[/tex] so
[tex]y=x^2+6x+7[/tex]