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What is 13^3x-1=91 solved? 

Guest Apr 30, 2017
 #1
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The answer is 0.041875294788348

Guest May 1, 2017
 #2
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13^(3x-1) = 91

(3x - 1)ln 13 = ln 91 

(3x - 1)ln 13 = ln 13 + ln 7

(3x - 2)ln 13 = ln 7

\(3x - 2 = \dfrac{\ln 7}{\ln13}=\log_{13}7\)

\(x = \dfrac{\log_{13}7+2}{3}\)

And then use ur calculator to get 0.919551471

MaxWong  May 1, 2017

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