Consider the Quadratic function $\displaystyle {f{{\left({x}\right)}}}={x}^{{2}}-{6}{x}-{7}$.
Its vertex is ( , ).
Its largest $\displaystyle {x}$-intercept is $\displaystyle {x}=$ .
Its $\displaystyle {y}$-intercept is $\displaystyle {y}=$ .