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1² - 2 (1) (-x) + x² / (1-x)
1 + 2x + x² / (1-x)
x² + 2x + 1 / (1-x)
aspa simple : x² + 2x +1
x +1
x + 1
(x+1)(x+1) / 1-x
(x+1)² / 1-x------> solución