Exponential Functions  TOPIC_SOLVED

Complex numbers, rational functions, logarithms, sequences and series, matrix operations, etc.

Exponential Functions

Postby Eszebel on Sun Mar 27, 2011 6:01 pm

So hopefully I'm posting this in the right area and all that...

I missed a day of trig class and don't understand how to do several kinds of problems relating to exponential functions. I have a test tomorrow, so I really need to figure how to solve them.

Here's an example...

1. Write an exponential equation, y = ab ^ x, for each of the following sets of points:
a) (3, 550) and (5, 1450)
b) (2, 300) and (20, 3500)

Thank you in advance for your help!
Eszebel
 
Posts: 2
Joined: Sun Mar 27, 2011 5:52 pm

Sponsor

Sponsor
 

Re: Exponential Functions  TOPIC_SOLVED

Postby maggiemagnet on Sun Mar 27, 2011 6:14 pm

Eszebel wrote:1. Write an exponential equation, y = ab ^ x, for each of the following sets of points:
a) (3, 550) and (5, 1450)
b) (2, 300) and (20, 3500)

For (a), plug each point into the equation. This will give you:




This is a system of non-linear equations. What do you get if you divide the second equation (left-hand side by left-hand side, right-hand side by right-hand side) by the first equation? You should end up with something that you can solve for the value of 'b'. Then you can solve either of the equations for 'a'.

:clap:
User avatar
maggiemagnet
 
Posts: 295
Joined: Mon Dec 08, 2008 12:32 am

Re: Exponential Functions

Postby Eszebel on Sun Mar 27, 2011 9:39 pm

...oh. I should've been able to figure that out xD Thanks!
Eszebel
 
Posts: 2
Joined: Sun Mar 27, 2011 5:52 pm


Return to Advanced Algebra ("pre-calculus")