Friday

November 21, 2014

November 21, 2014

Posted by **Adam** on Friday, October 29, 2010 at 6:53pm.

ln(x+8)+ln(x–8)=0

Im not sure how to approach this one. I tried moving the ln(x-8) to the other side and solving for x and that did not work. I also tried putting everything as an exponent to e. please help! thanks

- Calculus -
**Damon**, Friday, October 29, 2010 at 6:57pmthat is ln of product

ln (x^2-64) = 0

e^ln anything = anything

so

x^2-64 = e^0 = 1

x^2 -65 = 0

x = +/- sqrt 65

but ln of negative is undefined

so

x = +sqrt(65)

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