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# Logarithms

How are problems like this solved $$\log_7 (4x+1) + \log_5 (5x+3) = 4$$

I know how to use change of base formula but in solving exponents involving logarithms (e.g. $$a^{\log_b (2x+y)}$$) I get stucked.

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1 year, 6 months ago

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There is no exact form of $$x$$. You can only use approximation/numerical methods to get $$x \approx 7.06$$. · 1 year, 6 months ago