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Răspuns :

3 - √(x² + 3) = x  |²

[3 - √(x² + 3)]² = x²

3² - 6√(x² + 3) + x² + 3 = x²

9 - 6√(x² + 3) + 3 = 0

12 - 6√(x² + 3) = 0

6√(x² + 3) = 12

√(x² + 3) = 12/6

√(x² + 3) = 2  |²

x² + 3 = 4

x² =  4 - 3

x² = 1

x = 1