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Algebra Level 3

log π π ( x π ) = log π ( e π ) , x = ? \large \quad \log_{\sqrt [π]{π}} (x - π) = \log_{π} (e^π) \quad , \quad x = \ ?

π other than options given 2e e-π e e+π

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2 solutions

Rohit Udaiwal
Nov 14, 2015

We have: \log_\sqrt [π]{π} (x - π) = \log_{π} (e^π) \\ \implies \dfrac {1}{\frac {1}{\pi}} \log_{\pi}{(x-\pi)}= \log_{π} (e^π) \\ \implies \log_{\pi}{(x-\pi)^{\pi}}=\log_{\pi}{e^{\pi}} \\ \implies (x-\pi)^{\pi}=e^{\pi} \\ \implies x-\pi=e \\ \therefore x=e+\pi

Ok, thanks

Dwi Kawuryan - 5 years, 6 months ago

Just for the sake of obtaining knowledge, why were you able go from the original equation to the second step?

Sam Maltia - 5 years, 7 months ago

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By the properties of logarithms we have log a n b = 1 n log a b \log_{a^{n}}{b}=\dfrac{1}{n}\log_{a}{b} .

Rohit Udaiwal - 5 years, 7 months ago

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Okay, thanks!

Sam Maltia - 5 years, 6 months ago

A beautiful solution! Liked it and learnt a lot. Thank you!

Khurshed Ahmed - 5 years, 6 months ago

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Thanks Khurshed!

Rohit Udaiwal - 5 years, 6 months ago

We can apply exponentiation with base π π \sqrt[\pi]{\pi} anthe ecuation gets x π = π l o g π ( e π ) π x-\pi=\sqrt[\pi]{\pi ^{log_{\pi}(e^{\pi})}} = > x = e π π + π => x=e^{\frac{\pi}{\pi}}+\pi = > x = e + π => x=e+\pi I didn't create this website, but I'm sure the one or ones that did it were not thinking about contravening each other like babies, please, try to control yourselves. Maths are not for this

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