The image shows a geometric representation of the function f(x) = x2 – 2x – 6 written in standard form. what is this function written in vertex form? f(x) = (x –1)2 – 7 f(x) = (x +1)2 – 7 f(x) = (x –1)2 – 5 f(x) = (x +1)2 – 5