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VerifySolutions

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Option for Solve to verify solutions

VerifySolutions
Solve[Sqrt[x] + x == -2, x, VerifySolutions -> True] → {}Solve[Sqrt[x] + x == -2, x, VerifySolutions -> False] → {}NSolve[Sqrt[x] + x == -2, x, VerifySolutions -> True] → {}

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