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If \(7^{x+1} = 4\), what is \(7^{2x - 1}\)?

 Jul 7, 2020
 #1
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Square both sides

 

(7x+1)= 42       now multiply both sides by   7-3

(7x+1)2 (7-3 ) =   42 (7-3)

72x-1                 =   16/343 = ...........

 Jul 7, 2020

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