Which function in vertex form is equivalent to f of x is equal to 4 plus x squared minus 2 x ?
A
f of x is equal to open paren x plus 1 close paren squared plus 5B
f of x is equal to open paren x plus 1 close paren squared plus 3C
f of x is equal to open paren x minus 1 close paren squared plus 3D
f of x is equal to open paren x minus 1 close paren squared plus 5