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x²-4x-32=0
(x-8)(x+4)
x1 = 8
x2 = -4
⇔ (x -8) (x+4) = 0
⇔ x = 8 atau x = -4
rumus abc x1 ⇒ (-b+√b²-4ac) : 2a x2 = (-b-√b²-4ac) : 2a
= (4+ √16-4.(-32)) : 2 = (4- √16-4.(-32)) : 2
= (4 + 12) : 2 = (4 - 12): 2
x1 = 8 = -4