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2x²+6x-8 = 0 ---> faktorkan
(2x+8)(x-1)
maka:
2x+8 = 0
x - 1 = 0
x1 = -8/2 = -4 (nilai α)
x2 = 1 (nilai β)
persamaan baru untuk
α+3 = -4 + 3 = -1
β+3 = 1+3 = 4
(x+1)(x-4) --> x² - 3x - 4 = 0