00:01
So we have this function f of x is 28 times 0 .71 raised to the x power.
00:08
And so they're asking us to do f of negative 3 through positive 3.
00:12
And so all we need to do is take this negative 3 and plug it in up here at the top.
00:19
I showed it here in red as well.
00:21
We're going to use a calculator to do that.
00:23
So we will type in 28 and then a parentheses is important, times 0 .71 and raise that to the negative 3 power.
00:30
That first one there you get 78.
00:32
It says to the nearest hundredth.
00:34
So 78 .23 is my first answer.
00:39
And i'm going to do that for negative 2.
00:41
And i'm going to use 28 times 0 .71 to the negative 2 power instead.
00:48
And we'll get 55 .54.
00:52
Again, all by calculator.
00:55
And then i stopped writing it, but it's the same thing...