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Verified answer
2x^2 - 3x - 20 = 02x^2 - 8x + 5x - 20 = 0
2x(x - 4) + 5(x - 4) = 0
(2x + 5)(x - 4) = 0
2x + 5 = 0 atau x - 4 = 0
2x = -5 atau x = 4
x = -5/2
x = -2 1/2