00:01
So in this question, they say that the measurement of the side of a square floor tile is 10 inches with a possible error of 1 .32nd of an inch.
00:13
In part a, we are going to use differentials to approximate the possible propagated error in computing the area of the square.
00:23
So my possible error in the side length, so the error in the side length, that's what we call ds.
00:36
So my ds this time was 132nd of an inch.
00:42
And in part a, we are trying to find the error in computing the area of the square.
00:49
We are trying to find the value of da.
00:53
Now, before i relate d -s and d -a, i have to relate a and s.
01:01
What can i say about the area of a square? i can say that the area of a square is s -squared, side -squared.
01:13
Now, if that's a, what does that make, d -a? my da this time is 2sds.
01:26
My s, they said, was 10.
01:30
That's the measurement of the sideline.
01:32
So my s is 10, and my ds was 132nd.
01:40
And so i'm getting 20 over 32.
01:44
That simplifies to 5 eighths of a square inch...