You should end up with two equations:
Do you see where these equations come from?
To eliminate one of the variables, the easiest thing to do would be to divide the second equation by the first...
Sorry if this is wrong section, I'm not sure where else to post. I am stuck with this problem:
f(x)= m * 2kx
Question is: What is f(6)?
I can't figure how to solve either k or m; or how to substitute either of them for something useful. According to my textbook the answer is 64, but I have no idea how to get there. Any help is appreciated.
substitute x=4 first to the given relation and find : 36= m 2^(4k),
then substitute again x= 3 and find 27 = m 2^(3k)
divide these two equations and m disapears...you wil get 36/27=2^ k then get the logarithms of both sides to find the value of k .
the last step is to substitute k in one of the two equations and solve it for m ... After all these you know the complete formula of the function substitute x= 6 and find all what you need. As simple as such... try it....