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What is the difference between $\sqrt{81 + 4}$ and $\sqrt{81} + \sqrt{4}$?
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$\sqrt{81+4)} = \sqrt{85}$

whereas $\sqrt{81} + \sqrt{4}$

$= 9 + 2$

$= 11$
by Diamond (39,663 points)
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√(81+4) you have to add the terms before you can square root the answer and with √81 +√4. you first square root each term before adding.
by Wooden (3,935 points)