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Question Number 42176 by Lakshman Kumar last updated on 19/Aug/18

81(√)

$$\mathrm{81}\sqrt{} \\ $$

Commented by MrW3 last updated on 20/Aug/18

(√(81))=+9 ≠ −9

$$\sqrt{\mathrm{81}}=+\mathrm{9}\:\neq\:−\mathrm{9} \\ $$

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