SOAL UN SMA, tolong ya caranya gimana :)

langkah satu subtitusikan x = 0
f(x) = 8 (0,8)
subtitusikan f(x) = 0
[tex] - {x}^{2} + 2x + 8 = 0 \\ {x}^{2} - 2x - 8 = 0 \\ (x - 4)(x + 2) = 0 \\ x = 4 .x = - 2[/tex]
(4,0),(-2,0) jawaban D