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8 - x³ = ( 2 - x ) (4 + 2x +x² )
a^3 - b^3 = (a-b)(a^2 +ab +b^2)
Solo reemplazamos (a=2 , b=x)
8-x³ = (2-x)(2²+ 2x+ x²)
8-x²= (2-x)(4+2x+x²)
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