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La respuesta es \( 2\sqrt{21} \).
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Para calcular \( \sqrt{(x+2y)(x-2y)} \) con \( x=10 \) y \( y=2 \), primero sustituimos los valores en la expresión. Teniendo \( x + 2y = 10 + 2(2) = 10 + 4 = 14 \) y \( x - 2y = 10 - 2(2) = 10 - 4 = 6 \), multiplicamos estos resultados: \((x + 2y)(x - 2y) = 14 \cdot 6 = 84\). Finalmente, tomamos la raíz cuadrada: \(\sqrt{84} = \sqrt{4 \cdot 21} = 2\sqrt{21}\). Por lo tanto, el resultado es \( 2\sqrt{21} \).