How do you solve 5^(2x-1) = 7^(2x)?

1 Answer

x = frac{log 5}{2(log 5 - log 7)}

Explanation:

log 5^{2x - 1} = log 7^{2x}

(2x - 1) log 5 = 2x log 7

x (2 log 5 - 2 log 7) = 1 log 5

x = frac{log 5}{log 25 - log 49}

(25/49)^x = 5