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f(2) = 2(2)²-7(2)-5
= 8-14-5 = -11
(2,-11) melaluinya
f(-1) = 2(-1)² - 7(-1)-5
= 2 + 7 - 5 = 4
Melalui (-1,4) [Tidak melalui]
f(-4) = 2(-4)² - 7(-4) - 5
= 32 + 28 + 5
= 65
Melalui (-4,65)
Jika benar 55, berarti tidak melalui.