00:01
All right, so they give you a triangle, and the height is three feet less than the base.
00:05
So it doesn't matter what a triangle looks like.
00:08
Trying to make my base look like it's, and the height is the base minus three.
00:18
And we know the area of a triangle is one half base times height.
00:26
And we know the area and the problem is given to us as 20.
00:31
And it's in square feet.
00:34
I'm only bringing that to your attention so you recognize that the base is in feet and the height is in feet as well.
00:40
But what i would do to set up this problem is replace the height with b minus 3 is equal to 20.
00:50
Now while i'm at, i might as well multiply both sides by 2.
00:54
I just want to get rid of that that two that's on this side.
00:57
I don't like that.
00:59
And i'm also going to distribute that b in there.
01:01
So we're looking at b.
01:02
Squared minus 3b is equal to 40...