Como simplificar a expressão: (x+5)²-(x-5)² ?.... Pergunta de ideia derayanerose

March 2022 1 17 Report

Como simplificar a expressão: (x+5)²-(x-5)² ?

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Helvio

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$(x + 5)^2 - (x - 5)^2 \\ \\ (x + 5)*(x +5) - (x - 5)*(x - 5) \\ \\ x^2 + 5x + 5x + 25 - x^2 - 5x - 5x + 25 \\ \\ x^2 + 10x + 25 - x^2 + 10x - 25 \\ \\ => 20x
$

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