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x2 = x + 1
x4 - x2 + 1 =
(x2)^ - x + 1 + 1 =
(x + 1)^ - x + 2 =
x2 + 2x + 1 -x + 2 =
x2 + x + 3 =
x + 1 + x + 3 =
2x + 4
x4 - x2 + 1 = 2x + 4