FullSimplify[(2(5^k) - 17(5^(2k)) - 1)^2 - 4((3(5^(2k)) - 2(5^k) - 1)(4(5^k)(5^(k+1) - 1)))]FullSimplify[(2(5^k) - 17(5^(2k)) - 1)^2 - 4((3(5^(2k)) - 2(5^k) - 1)(4(5^k)(5^(k+1) - 1)))]

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