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titik (-3, p)
p = 3.(-3)² - 2(-3) - 8
p = 3.9 + 6 - 8
p = 27 + 6 - 8
p = 25
titik (q, -7)
-7 = 3q² - 2q - 8
3q² - 2q - 8 + 7 = 0
3q² - 2q - 1 = 0
(3q + 1)(q - 1) = 0
3q + 1 = 0 atau q - 1 = 0
3q = -1/3 atau q = 1