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-2x^2 - 5x + 12 < 0
2x^2 + 5x + 12 = 0
( 2x - 3 ) ( x + 4 ) = 0
2x - 3 = 0 <=> x + 4 = 0
2x = 3 <=> x = -4
x = 3/2
jadi , X1 = 3/2 dan X2 = -4
semoga membantu ^_^