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If y = (5 - x)3, and dydx...

If y = (5 - x)3, and dydx

A.

15(5x)4

B.

3(5x)4

C.

3(5x)4

D.

15(5x)4

Correct answer is C

y = (5 - x)3 

dydx = -3(5 - x)4

= 3(5x)4