WEBVTT
1
00:00:00.140 --> 00:00:01.790 A:middle L:90%
we know the first thing we can do is we
2
00:00:01.790 --> 00:00:03.700 A:middle L:90%
can take the derivative, which we can. Rightist
3
00:00:03.710 --> 00:00:08.220 A:middle L:90%
off prime of acts is negative. 14 next to
4
00:00:08.220 --> 00:00:14.890 A:middle L:90%
the sex minus 20 X Cube plus 27 x squared
5
00:00:15.740 --> 00:00:18.010 A:middle L:90%
. We know our first estimate for acts can be
6
00:00:18.010 --> 00:00:29.519 A:middle L:90%
negative 1.8 using the formula. This is what we're
7
00:00:29.519 --> 00:00:59.759 A:middle L:90%
putting into divide by the derivative. Do the same
8
00:00:59.770 --> 00:01:03.829 A:middle L:90%
thing with negative 0.8 this time, which is our
9
00:01:03.829 --> 00:01:15.049 A:middle L:90%
next zero. And then lastly, with 1.2,
10
00:01:33.040 --> 00:01:34.409 A:middle L:90%
we can conclude our three axes to be negative.
11
00:01:34.409 --> 00:01:53.250 A:middle L:90%
1.69 31203 Negative 0.744 66668 in 1.265 it's 709