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College Math Professor
Let x = sqrt(3+2sqrt(2))
Then x2 = 3 + 2sqrt(2)
x2 - 3 = 2sqrt(2)
Now square both sides
x4 - 6x2 + 9 = 8
Solve .x4 - 6x2 + 1 = 0
Clearly, from the 1st line, x >0 so it is NOT correct that x = -sqrt(2) - 1 which is clearly negative.
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