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√20 = √5.4

√4 = 2

^ ding ding ding

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