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y = 2x² + 5x + 8
y = x² - 5x - 17
2x² + 5x + 8 = x² - 5x - 17
x² + 10x + 25 = 0
(x + 5)² = 0
x + 5 = 0
x = - 5
HP = (m, 3n) = (-5, -5)
→ m = -5 dan n = -5/3
2m - n = 2 (-5) - (-5/3)
= -10 + 5/3
= -25/3