Question

Which graph represents the function f(x) = x2 − 2x − 8?

Answer 1

\(\normalsize\color{blue}{ y= x^2 − 2x − 8 }\)
\(\normalsize\color{blue}{ y = x^2 − 2x \color{red}{ +1-9 } }\)
\(\normalsize\color{blue}{ y = x^2 − 2x +1\color{red}{ -9 } }\)
\(\normalsize\color{blue}{ y = (x-1)^2-9 }\)

does this tell you anything ?