What is the aquare root of 20?
by 
vanbrooker
ANSWERS: 4
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20 = 2*2*5 = 2-squared times five Therefore sqrt(20) = 2*sqrt(5) The square root of 5 is an irrational number than cannot be expressed in any simpler way.
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Without getting into a decimal approximation, you can reduce sqrt(20) because you know that it's equal to sqrt(5)*sqrt(4). You also know that sqrt(4) = 2, so then, sqrt(20) = 2*sqrt(5)
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Plus or minus two times the square root of five.
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2V5
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