00:01
And hello, we're going to look at chapter 12, section 5, problem number three.
00:07
So in this problem, we want to find a tailor series for our given function.
00:13
So in this case, of x equals x squared, e to the x.
00:16
And we also want to find the interval of convergence.
00:20
So what we're going to start with is a elementary tailor series, which we already know.
00:28
So in this case, that would be e to the x.
00:35
And so our taylor expansion for e to the x is 1 plus x plus x squared over 2 factorial, plus x cubed over 3 factorial.
00:53
And then plus if we get to our nth term, we will write that as x to the n over n factorial.
01:01
And of course, it's infinite, so keeps on going.
01:06
And this would be true or have an interval of convergence for all x in, and it's all reals.
01:19
So from negative infinity to infinity...