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\left(\sqrt{2}\right)^{2}+6\sqrt{2}\sqrt{3}+9\left(\sqrt{3}\right)^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(\sqrt{2}+3\sqrt{3}\right)^{2}.
2+6\sqrt{2}\sqrt{3}+9\left(\sqrt{3}\right)^{2}
The square of \sqrt{2} is 2.
2+6\sqrt{6}+9\left(\sqrt{3}\right)^{2}
To multiply \sqrt{2} and \sqrt{3}, multiply the numbers under the square root.
2+6\sqrt{6}+9\times 3
The square of \sqrt{3} is 3.
2+6\sqrt{6}+27
Multiply 9 and 3 to get 27.
29+6\sqrt{6}
Add 2 and 27 to get 29.
\left(\sqrt{2}\right)^{2}+6\sqrt{2}\sqrt{3}+9\left(\sqrt{3}\right)^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(\sqrt{2}+3\sqrt{3}\right)^{2}.
2+6\sqrt{2}\sqrt{3}+9\left(\sqrt{3}\right)^{2}
The square of \sqrt{2} is 2.
2+6\sqrt{6}+9\left(\sqrt{3}\right)^{2}
To multiply \sqrt{2} and \sqrt{3}, multiply the numbers under the square root.
2+6\sqrt{6}+9\times 3
The square of \sqrt{3} is 3.
2+6\sqrt{6}+27
Multiply 9 and 3 to get 27.
29+6\sqrt{6}
Add 2 and 27 to get 29.