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8-x²>√x²
8>x²+x²
8>2x²
4>x²
2>x
(8-x^2)^1/2 > x
8^1/2 - (x^2)^1/2 > x
(2^3)^1/2 - (x^2)^1/2 > x
2^3/2 - x > x
2^3/2 > 2x
2x < 2^3/2
x < (2^3/2)/2^1
x < 2^(3/2-1)
x < 2^1/2
x < √2