2) x² = (x-1)² + (x-1) + x
(x-1)² + (x-1) + x
= x²-2x+1 + x-1 + x
= x²
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2) x² = (x-1)² + (x-1) + x
(x-1)² + (x-1) + x
= x²-2x+1 + x-1 + x
= x²