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Simplify √27 * √50 ∕ √54

 Jun 4, 2017
 #1
avatar+558 
+2

\(\frac{\sqrt{27}\times\sqrt{50}}{\sqrt{54}}\)

 

Write the numbers as products of primes.

 

\(=\frac{\sqrt{3\times3\times3}\times\sqrt{2\times5\times5}}{\sqrt{2\times3\times3\times3}}\)

 

The 2 and 3s on the top and bottom cancel out.

 

\(=\sqrt{5\times5}\)

\(=5\)

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 Jun 4, 2017
 #2
avatar+7372 
+1

\(\dfrac{\sqrt{27}\cdot\sqrt{50}}{\sqrt{54}}\\ =\dfrac{\sqrt{3^2\cdot 3}\cdot \sqrt{5^2\cdot 2}}{\sqrt{3^2\cdot 3\cdot 2}}\\ =\dfrac{\sqrt{3^2}\cdot \sqrt3 \cdot\sqrt{5^2}\cdot \sqrt2}{\sqrt{3^2}\cdot\sqrt{3}\cdot \sqrt{2}}\\ =\dfrac{3\cdot 5\cdot\sqrt3 \cdot \sqrt2}{3\cdot\sqrt3\cdot\sqrt2}\\ =5 \)

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 Jun 4, 2017

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