use differentials to determine by approximately how many square centimeters does the area of a square table increase if its diagonal is increased from 4 centimeters to 4.092 centimeters

the question is

The area of table increases by approximately (??) square centimetres

4 answers

Damon did one of these for you a while ago. Can you not use the same logic at least to get started here?
I'm doing my assignment but we did not cover these stuff yet and they but them In our online assignment
well Diagonal = D = x sqrt 2
so dD = sqrt 2 dx

a = x^2
so
da = 2 x dx etc
Thank You very much Mr Damon