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⇒ x1-x2 = 1
√D/a = 1
√D = a
D = a²
b²-4ac = a²
p²-4.1.(p+1) = 1²
p²-4p-4-1 = 0
p²-4p-5 = 0
(p-5)(p+1) = 0
p-5 = 0 atau p+1 = 0
p = 5 atau p = -1