How do you solve 9x−4=81? Precalculus Solving Exponential and Logarithmic Equations Logarithmic Models 1 Answer Alan P. Feb 12, 2015 9x−4=81 implies x=6 The only value p for which 9p=81 is p=2 so x−4=2 → x=6 Answer link Related questions What is a logarithmic model? How do I use a logarithmic model to solve applications? What is the advantage of a logarithmic model? How does the Richter scale measure magnitude? What is the range of the Richter scale? How do you solve logx+log(x+15)=2? How do you solve the equation 2log4(x+7)−log4(16)=2? How do you solve 2logx4=16? How do you solve 2+log3(2x+5)−log3x=4? How do you solve 3x=14? See all questions in Logarithmic Models Impact of this question 19259 views around the world You can reuse this answer Creative Commons License