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Simplify \sqrt{(√(21) -2√(7) )^(2) }
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2 votes
Simplify
\sqrt{(√(21) -2√(7) )^(2) }

User Snez
by
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1 Answer

2 votes

Answer:


√(7)

Explanation:


\sqrt{( √(21) - 2 √(7)) {}^(2) } \\ \\ ( √(21) - 2 √(7) ) = 3 √(7) - 2 √(7) = √(7)

User MegaMatt
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