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f(x) : (x + 3)(x - 3)
f(-3) = 0 dan f(3) = 0
f(x² + x - 9) = 0 jika:
x² + x - 9 = - 3 dan x² + x - 9 = 3
x² + x - 6 = 0 x² + x - 12 = 0
(x + 3)(x - 2) = 0 (x + 4)(x - 3) = 0
ada faktor (x - 2) ada faktor (x + 4)
Jawaban: 1 dan 3