Consider the Quadratic function $\displaystyle {f{{\left({x}\right)}}}={x}^{{2}}-{6}{x}-{16}$.
Its vertex is ( , ).
Its smallest $\displaystyle {x}$-intercept is $\displaystyle {x}=$ .
Its $\displaystyle {y}$-intercept is $\displaystyle {y}=$ .