00:02
So we're going to evaluate an expression in terms of k and n for some given values of k and n.
00:11
So let's see, we got negative k squared minus 3k.
00:25
Oh, not bad.
00:26
K is always giving me some trouble.
00:32
Minus 5n plus 4n.
00:42
Oh, man.
00:43
Always trouble there too.
00:47
The threes and the close parentheses and eights, ooh, they're tough.
00:54
Okay, so for k equals negative one and n equals negative two.
01:11
All right.
01:13
So definitely want to combine like terms here, but first, like i want to take care of this guy right here.
01:23
Let's distribute that negative.
01:26
So we've got negative k squared.
01:32
Okay, so negative 1 times 3k, that's just going to be minus 3k.
01:39
But negative 1 times negative 5n, that'll change the sign.
01:43
So plus 5n.
01:48
So always watch out for the negatives outside parentheses.
01:53
You've got to distribute those.
01:55
Okay, 4n.
01:58
Okay, that was horrible.
01:59
Let's just get rid of all that.
02:01
Okay.
02:02
Plus 4n.
02:06
Okay.
02:07
Okay, let's see, like terms.
02:09
We got a k here and a k here, but one of them's k squared and the other one's k...