00:01
So for this question, they're saying the area of a rectangle is 21x squared plus 22x minus 8.
00:05
And the height is 3x plus 4.
00:08
And i want to find its base.
00:09
So remember, find the area of a rectangle.
00:15
It would be my base times my height.
00:20
And that would be the area.
00:21
So if i have the area, i'm going to take my area and divide it by my height to find my base.
00:30
So 21x squared.
00:32
Plus 22x minus 8, and i'm dividing it by my height, which is 3x plus 4.
00:40
Now the first thing you want to do is you want to take your first term and divided by your first term.
00:45
So 21 divided by 3 is going to be 7.
00:49
X squared divided by x is x.
00:51
Now i'm going to take my answer for that and multiply it by every term that i am going to divide by.
00:57
So 7x times 3x is 21x squared.
01:04
7x times 4 is 28x.
01:08
Now i'm going to subtract...