Express the Function in the Formss the Function in the Form

Express the function in the formss the function in the form f(x) $$f ( x ) = a ( x - h ) ^ { 2 } + k$$ k a nd indicate the vertex.
- $$f ( x ) = x ^ { 2 } - 4 x + 8$$

A) $f ( x ) = ( x + 2 ) ^ { 2 } + 20$
vertex: $( - 2,20 )$
B) $f ( x ) = ( x - 2 ) ^ { 2 } + 4$
vertex: $( 2,4 )$
C) $f ( x ) = ( x - 2 ) ^ { 2 } - 4$
vertex: $( 2 , - 4 )$
D) f(x) = (x + 4) 2 + 40 vertex: (-4, 40)