What is f of x is equal to 8 x squared plus 4 x written in vertex form?
A
f of x is equal to 8 times open paren x plus 1 half close paren squared minus 4B
f of x is equal to 8 times open paren x plus 1 fourth close paren squared minus 1 halfC
f of x is equal to 8 times open paren x plus 1 fourth close paren squared minus 1 over 16D
f of x is equal to 8 times open paren x plus 1 half close paren squared minus 2