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Verified answer
Mapel : MatematikaBab :Persamaan Kuadrat
x^2 - 4x - 5 = 0
(x - 5)(x + 1) = 0
x1 = 5
x2= -1
x1 = (3x1 - 1) = 3(5) - 1 = 15 - 1 = 14
x2 = (3x2 - 1) = 3(-1) - 1 = -3 - 1 = -4
(x - x1)(x - x2)
= (x - 14)(x + 4)
= x^2 + 4x - 14x - 56
= x^2 - 10x - 56