Evaluate
2\sqrt{2}+4\approx 6.828427125
Factor
2 \sqrt{2} {(\sqrt{2} + 1)} = 6.828427125
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2\sqrt{2}+2\left(\sqrt{2}\right)^{2}
Use the distributive property to multiply \sqrt{2} by 2+2\sqrt{2}.
2\sqrt{2}+2\times 2
The square of \sqrt{2} is 2.
2\sqrt{2}+4
Multiply 2 and 2 to get 4.
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