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\sqrt{\left(1+1\right)^{2}+\left(3-1\right)^{2}+\left(2-4\right)^{2}}
The opposite of -1 is 1.
\sqrt{2^{2}+\left(3-1\right)^{2}+\left(2-4\right)^{2}}
Add 1 and 1 to get 2.
\sqrt{4+\left(3-1\right)^{2}+\left(2-4\right)^{2}}
Calculate 2 to the power of 2 and get 4.
\sqrt{4+2^{2}+\left(2-4\right)^{2}}
Subtract 1 from 3 to get 2.
\sqrt{4+4+\left(2-4\right)^{2}}
Calculate 2 to the power of 2 and get 4.
\sqrt{8+\left(2-4\right)^{2}}
Add 4 and 4 to get 8.
\sqrt{8+\left(-2\right)^{2}}
Subtract 4 from 2 to get -2.
\sqrt{8+4}
Calculate -2 to the power of 2 and get 4.
\sqrt{12}
Add 8 and 4 to get 12.
2\sqrt{3}
Factor 12=2^{2}\times 3. Rewrite the square root of the product \sqrt{2^{2}\times 3} as the product of square roots \sqrt{2^{2}}\sqrt{3}. Take the square root of 2^{2}.