Using differentials, find the approximate value of each of the following up to 3 places of decimal.
Consider y = 
Let x = 81 and Δx = 0.5. Then, we get
Δy = 
=
⇒ 
= Δy + 3
Now, dy is approximately equal to Δy and is given by:
dy = 
= 0.0046
Therefore, the approximate value of 
is 3.0046.
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