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\left(2\sqrt{3}+\sqrt{8}\right)\left(\sqrt{3}-\sqrt{2}\right)
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}.
\left(2\sqrt{3}+2\sqrt{2}\right)\left(\sqrt{3}-\sqrt{2}\right)
Factor 8=2^{2}\times 2. Rewrite the square root of the product \sqrt{2^{2}\times 2} as the product of square roots \sqrt{2^{2}}\sqrt{2}. Take the square root of 2^{2}.
2\left(\sqrt{3}\right)^{2}-2\sqrt{3}\sqrt{2}+2\sqrt{2}\sqrt{3}-2\left(\sqrt{2}\right)^{2}
Apply the distributive property by multiplying each term of 2\sqrt{3}+2\sqrt{2} by each term of \sqrt{3}-\sqrt{2}.
2\times 3-2\sqrt{3}\sqrt{2}+2\sqrt{2}\sqrt{3}-2\left(\sqrt{2}\right)^{2}
The square of \sqrt{3} is 3.
6-2\sqrt{3}\sqrt{2}+2\sqrt{2}\sqrt{3}-2\left(\sqrt{2}\right)^{2}
Multiply 2 and 3 to get 6.
6-2\sqrt{6}+2\sqrt{2}\sqrt{3}-2\left(\sqrt{2}\right)^{2}
To multiply \sqrt{3} and \sqrt{2}, multiply the numbers under the square root.
6-2\sqrt{6}+2\sqrt{6}-2\left(\sqrt{2}\right)^{2}
To multiply \sqrt{2} and \sqrt{3}, multiply the numbers under the square root.
6-2\left(\sqrt{2}\right)^{2}
Combine -2\sqrt{6} and 2\sqrt{6} to get 0.
6-2\times 2
The square of \sqrt{2} is 2.
6-4
Multiply -2 and 2 to get -4.
2
Subtract 4 from 6 to get 2.