00:01
So in this question, we want to find the mclaren series for f of x equals 8x squared times e to the negative 3x.
00:08
We're going to start with a memorized mclaren series for e to the x.
00:13
So what's e to the x? it's one plus x, plus x squared over 2 factorial, plus x cubed over 3 factorial, plus x to the 4th over 4 factorial, this pattern continues forever and ever.
00:34
So what if i had e to the negative 3x? well, on the left, i replaced x with negative 3x.
00:43
So on the right, i replace every instance of x with negative 3x as well.
00:52
So i replace every instance of x with negative 3x.
01:01
So we're going to get this guy here.
01:04
We're getting e to the negative 3x power.
01:08
Looks like 1 plus negative.
01:12
Negative 3x plus negative 3x quantity being squared over 2 factorial plus negative 3x being cubed over 3 factorial plus negative 3x quantity to the 4th over 4 factorial now if i simplify this e to the negative 3x it's 1 minus 3x plus 9x squared over 2 minus 27x cubed over plus 81x to the 4th over 24.
01:57
And now i am going to multiply by 8x squared.
02:04
So if i multiply all of these terms by 8x squared, what am i getting? well, i'm getting 8x squared, minus 24x cubed plus 72x to the 4th, over 2 minus...