Using differentials, find the approximate value of each of the following up to 3 places of decimal.

Question

Philoid · Accepted Answer

Consider y =

Let x = 400 and Δx = 1. Then, we get

Δy =

=

⇒ = Δy + 20

Now, dy is approximately equal to Δy and is given by:

dy =

= 0.025

Therefore, the approximate value of is 20.025.