My questions require me to put functions into the a/(1-r) form. I don't understand how to do this.
The question- Find a power series for the function, centered at c, and determine the interval of convergence.
f(x)= 1/(2-x), c=5
How do I put this into the a/(1-r) form?
I can see that, but what about the c=5? I don't understand how to incorporate that and create the a/(1-r) form.
My key shows 1/(-3-(x-5)) = (-1/3)/(1+(1/3)(x-5))
I can see how they derived the 2nd part from the first, but I have no clue how they even got the first part! Help!
If you want a series centered at c = 0, you let r be something times x. If you want a series centered at c = 5, you let r be something times x-5. To get an x-5 in the denominator, you do the following:
.
Then proceed to divide the numerator and denominator by -3. Then you'll have the appropriate form with a = -1/3 and r = (1/3)(x-5).