Which equation is y is equal to 9 x squared plus 9 x minus 1 rewritten in vertex form?
A
y is equal to 9 times open paren x plus 1 half close paren squared minus 13 fourthsB
y is equal to 9 times open paren x plus 1 half close paren squared plus 5 fourthsC
y is equal to 9 times open paren x plus 1 half close paren squared minus 5 fourthsD
y is equal to 9 times open paren x plus 1 half close paren squared minus 1