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if x8 = 20 then x = - eighth root of 20 or x = eighth root of 20

eighth root of 20 = 1.4542154....

Maybe you mean 8x = 20

If so Ln (8x) = Ln (20) => x Ln(8)= Ln(20) => x = Ln(20)/Ln(8) = 1.4406426...

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Q: How do you solve for the x power of 8 is 20?
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