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How do you figure out simplest radical form with variables and/or exponents and/or numbers outside the square root

• Math (Simplest Radical Form) -

if taking nth roots, look for nth powers and take them out of the radical, since the nth-root of x^n = x

example:
√300 = √100√3 = 10√3

∛640 = ∛64∛10 = 4∛10

∜80 = ∜16∜5 = 2∜5

• Math (Simplest Radical Form) -

What is the 9th root of 64, in simplest radical form?

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