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All prime numbers have irrational number square roots, so if you try to find the square root of a non-perfect square number use them to simplify it. For example,

±√125 = ±√25*5 = ±5√5 (when you want to show both the square roots)

√72 = √36*2 = 6√2

√-27 = √-9*3 = 3i√3

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Q: Are irrational numbers used to find square roots?
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