00:01
Hi there, in this question there is a poster.
00:05
So let me just throw a poster.
00:12
And this poster, let's say this is a and this a b.
00:16
And there are some margins.
00:17
So we have the margin at the bottom.
00:20
Let's say this is the margin here.
00:23
And we have margin at the sides.
00:26
So the margin here is 1 inch.
00:30
The margin here is 1 inch.
00:31
The margin here is one inch and at the top we have the margin as two so what about the side for this one so the side for this length is a minus two and the side for the other one which is one one so this is b minus two here i'm sorry this is b minus three so the area of this shaded region here because we need to just maximize this area here, which is a minus 2 times b minus 3.
01:10
And also in the question, we know that the a times b, which is equal to 1 ad, so b is equal to 1a over a.
01:19
Let's plug in the value here, a minus 2 times 1a2 over a minus 3, which is f of a...