$$\left. \begin{array} { l } { x ^ { 2 } - 7 x + 12 } \\ { \quad ( 1 ) x = 1 \quad ( 2 ) x = 3 \quad ( 3 ) x = 5 \quad ( 4 ) x = 0 } \end{array} \} \right.$$
$y=12$
$$x=2x$$
$$x-2x=0$$
$$-x=0$$
$$x=0$$
$$y=0^{2}-7\times 0+12$$
$$y=0-7\times 0+12$$
$$y=0+0+12$$
$$y=12$$
$$x=0$$ $$y=12$$
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