00:01
Hi, in this video we have the function f of x is equal to b to the x, where we assume that b is some positive number.
00:11
The first thing we want to do is we want to find the taylor series for b, b to the x.
00:17
And so basically, well, you might know the definition involves the derivatives, and so the derivative of f prime is the natural log of b times b to the x.
00:27
The second derivative is the natural log of b times the natural log of b again, so it will be squared, times bx, and so on.
00:37
So just like looking at the answer choices, just using process of elimination, i found that the answer should be d, it should be 1 plus natural log of b x over 1 plus natural log of b squared x squared 2.
01:04
And then what we want to do is we want to find the limit or the radius of convergence.
01:08
So we do the ratio test and compute the limit as n goes to infinity of an plus 1 over an...