Solving Logarithmic Equations
Posted by: raysmithtx Post date: January 15th, 2012
www.gdawgenterprises.com This video shows how to use the change of base formula in conjunction with the graphing calculator methods of graphing, using Equation Solver, and substituting. The log of any number to any positive base can be found using the change of base formula. Using these methods, problems that might otherwise seem difficult can be pretty easy.
- Tags: Equations, Logarithmic, Solving
January 15th, 2012 at 1:28 pm
use a different variable instead of x in solver and you will get the correct answer
January 15th, 2012 at 1:35 pm
THANK YOU! You probably just saved me from failing this part of my mid-term tomorrow!
January 15th, 2012 at 1:55 pm
@tonystrick9 Thanks for figuring this out. I’ve been at a loss for months. Even my TI rep didn’t know. It looks like what happens is this: when it first evaluates, it starts at the value stored first, then goes from -10 to the 99th power all the way to 10 to the 99th power looking for the answer. If the first thing it looks at is undefined, which it would be when 3 – 2x is less than zero, it gives the nonreal answer it gives. X to start has to be < or equal to 1.5 to work. Thanks for help.
January 15th, 2012 at 1:56 pm
I think, the equation solver will use the variable stored in it already to solve the equation.. so if you reset the variable back to zero.. By storing zero in the variable you are using, the solver will give you the right answer.. I hope this makes since