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Verified answer
Mapel : Matematikabab : Persamaan Kuadrat
18 + 5x - 2x^2
-2x^2 + 5x + 18
= -(2x^2 + 4x - 9x - 18)
= -(2x(x + 2) - 9(x + 2))
= -(x + 2) ( 2x - 9)
x + 2 = 0
x = -2
2x - 9 = 0
2x = 9
x = 9/2
HP = { -2,9/2 }