Which values for h and k are used to write the function f of x is equal to x squared plus 12 x plus 6 in vertex form?
A
h is equal to 6 comma k is equal to 36B
h is equal to 6 comma k is equal to 30C
h is equal to negative 6 comma k is equal to negative 30D
h is equal to negative 6 comma k is equal to negative 36