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Quick Question: How does √20 = 2√5 Please Explain I am confused

Mathematics
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√20 = √5.4
√4 = 2
^ ding ding ding

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Other answers:

How does √20 = √5.4?
You can factor 20 out to equal 2*2*5. The square root of this is 2 times the square root of 5
Can you show me how this would work if say it was √30?
30 factors to 5*2*3 so you cannot change the square root of it.
√40 does factor to 2*2*10 can you show how it work with this
Would it be 2√10
exactly.
Thanks

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