Monday

September 1, 2014

September 1, 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)

**Related Questions**

calculus - solve the logarithmic equation. be sure to reject any value of x that...

pre-calculus - solve the following logarithmic equation. be sure to reject any ...

Logs. - Can you please help me with the following log. problems? thanxs! Solve ...

calculus - actually an ODE question(but there's no diff. eq. subforum) (y^2)(dy...

pre-calculus - solve the logarithmic equation. be sure to reject any value of x ...

calculus - solve the logarithmic equation. Be sure to reject any value of x that...

calculus - Please help me? ln(x+1)-ln(x-2)=ln(5) 1. Solve equation by setting up...

pre-calculus - solve the following logarithmic equation. Be sure to reject any ...

Calculus - Solve the differential equation dy/dx = -xe^y and determine the ...

Algebra - 6x^2+9cx= 6c^2 I tried moving the 6c^2 to the other side of the ...