What is 13^3x-1=91 solved?
The answer is 0.041875294788348
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