Friday, 19 June 2015

algebra precalculus - Why is ln(sqrt|2x5|)+frac12ln(|2x+3|)neqln(sqrt|2x5|)+ln(sqrt|2x+3|) in Wolfram Alpha?



According to Wolfram Alpha, 12ln(|2x+3|)=ln(|2x+3|)



is always true, which makes sense given what I know of log rules.



However, if I add the expression ln(|2x5|) to both sides of that equation, as such: ln(|2x5|)+12ln(|2x+3|)=ln(|2x5|)+ln(|2x+3|)



WA tells me that the two sides of this equation are not always equal! How is this possible if 12ln(|2x+3|)=ln(|2x+3|) is always true and I'm adding the same expression to both sides of the equation?
What's going on here?




EDIT: Here's the WA output: enter image description here


Answer



OK I tried it. Now what? Is this different from yours?



WA image


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