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If u(x,y) =x^(2) + 3xy + y-2019, then (...

If `u(x,y) =x^(2) + 3xy + y-2019`, then `((del u)/(del x))_((4,-5))` is equal to

A

`-4`

B

`-3`

C

`-7`

D

13

Text Solution

Verified by Experts

The correct Answer is:
C
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