How do you solve #25^(x-1)=125^(4x)#? Precalculus Properties of Logarithmic Functions Natural Logs 1 Answer Gerardina C. Aug 19, 2016 #x=-1/5# Explanation: Since #25=5^2# and #125=5^3# you can rewrite: #5^(2(x-1))=5^(3(4x))# that implies: #2(x-1)=3(4x)# that's #2x-2=12x# #10x=-2# #x=-1/5# Answer link Related questions What is the natural log of e? What is the natural log of 2? How do I do natural logs on a TI-83? How do I find the natural log of a fraction? What is the natural log of 1? What is the natural log of infinity? Can I find the natural log of a negative number? How do I find a natural log without a calculator? How do I find the natural log of a given number by using a calculator? How do I do natural logs on a TI-84? See all questions in Natural Logs Impact of this question 4019 views around the world You can reuse this answer Creative Commons License