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(1998 x 1996 x 1994 x 1992) + 16
= 15840559200384 + 16
= 15.840.559.200.400
√15840559200400 = 3.980.020
Semoga cukup jelas dan memuaskan !!
misal:
1998 = x
maka:
√(x(x - 2)(x - 4)(x - 6) + 16) = √(x⁴ - 12x³ + 44x² - 48x + 16)
= (3 - √5) dan (3 + √5)