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Question: i really need someone to explain this step to me...

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I really need someone to explain this step to me. Every formula I can find makes my answer come out to be 10log(1-10x)-10log(10x) and NOT 10log(1-10x)-10log(x). No matter what I try I can't figure out how to reconcile this unexplained multiple of 10 and both resources I have to check my solution just skips over that part exactly like Wolfram-Alpha does (picture). **log refers to the natural logarithm (ln)**

= 20 tanh-1 (1-20 x)-constant STEP 11 Which is equivalent for restricted x values to: Answer 10 log(1 10 x) 10 log(x)+constant

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