Monday

March 30, 2015

March 30, 2015

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)

**Answer this Question**

**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...

help with solving - x^2+(x-2)^2 = (2x-6)^2 solve for x. thanks so much. Please ...

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...

algebra - in solving the equation (x +2)(x - 2) = 32 eric stated the solution to...

Algebra - Solve each system graphically. #6. 4x - y = 9 x - 3y = 16 I need to ...

math--pre alg - not sure i did right 3(f+2)+9=13+5f 3f+6+9 = 13+5f +9 3F+15 = 12...