[tex]( \sqrt{32x {}^{2} y} )( \sqrt{20xy {}^{5} } ) \\ \\ \sqrt{32x {}^{2}y \times 20xy {}^{5} } \\ \\ \sqrt{640x {}^{3}y {}^{6} } \\ \\ 8xy {}^{3} \sqrt{10x} [/tex]
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