x = 4 (√5 - 1) (4√5 - 1) (8√5 - 1) (16√5 - 1)
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(√5 + 1) (4√5 + 1) (8√5 + 1) (16√5 + 1) * (√5 - 1) (4√5 - 1) (8√5 - 1) (16√5 - 1)
x = 4 (√5 - 1) (4√5 - 1) (8√5 - 1) (16√5 - 1)
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(5 - 1) (√5 - 1) (4√5 - 1) (8√5 - 1)
x = 4 (√5 - 1) (4√5 - 1) (8√5 - 1) (16√5 - 1)
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4 (√5 - 1) (4√5 - 1) (8√5 - 1)
x = 16√5 - 1
x + 1 = 16√5
(x + 1)48 = (16√5)48
(x + 1)^48 = [ 5^(1/16 )]^48
(x + 1)^48 = 5^(48/16)
(x + 1)^48 = 5^3 = 125