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yaroslaw [1]
3 years ago
10

How to simplify the square root of 3 over the square root of 21

Mathematics
2 answers:
Alika [10]3 years ago
7 0

3 * 7 = 21, so

\sqrt{21}=\sqrt{3\cdot7}=\sqrt3\sqrt7

Then

\dfrac{\sqrt3}{\sqrt{21}}=\dfrac1{\sqrt7}

and you can rationalize the denominator to write this as

\dfrac1{\sqrt7}\cdot\dfrac{\sqrt7}{\sqrt7}=\dfrac{\sqrt7}7

Ivanshal [37]3 years ago
6 0

answer: √3⋅√21 = 3√7

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