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\left(5\times 4\sqrt{2}\right)^{2}
Factor 32=4^{2}\times 2. Rewrite the square root of the product \sqrt{4^{2}\times 2} as the product of square roots \sqrt{4^{2}}\sqrt{2}. Take the square root of 4^{2}.
\left(20\sqrt{2}\right)^{2}
Multiply 5 and 4 to get 20.
20^{2}\left(\sqrt{2}\right)^{2}
Expand \left(20\sqrt{2}\right)^{2}.
400\left(\sqrt{2}\right)^{2}
Calculate 20 to the power of 2 and get 400.
400\times 2
The square of \sqrt{2} is 2.
800
Multiply 400 and 2 to get 800.