[x2 + 3x – 1]2 – (x4 – 6x3 – 2x2) =
[x2 + 3x – 1]2 – (x4 – 6x3 – 2x2) = 2x²+6x-2 - (x⁴-6x³-2x²) = 2x²+6x-2-x⁴+6x³+2x² = -x⁴+6x³+4x⁴+6x-2
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[x2 + 3x – 1]2 – (x4 – 6x3 – 2x2) = 2x²+6x-2 - (x⁴-6x³-2x²) = 2x²+6x-2-x⁴+6x³+2x² = -x⁴+6x³+4x⁴+6x-2