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L = D akar D / 6 a^2
D = b^2 - 4ac
D = 16 - 4.1.(-5) = 16 + 20 = 36
jadi L = 36 .akar36 / 6 (1)^2 = 36 . 6 / 6 = 36
jadi luas kurvanya adalah 36 satuan luas