Question

Calcule o valor de x, sabendo que (x + 5)² - (x - 5)² = 40

Answer 1

Olá

$\LARGE{}(x + 5)^{2} - (x - 5)^{2} = 40 \\ \LARGE{}10 \times 2x = 40 \\ \LARGE{}20x = 40 \\ \LARGE{}\LARGE\boxed{x = 2}$

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