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20971520=5*(-4)^(n-1)

 Mar 10, 2021
 #1
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+1

Divide both sides of the equation to get

4194304 = (-4)n-1      there is no answer to this      +411 = 4194304       but   -411 = - 4194304

         did you enter your Q correctly?

 Mar 10, 2021

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