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Find dy/dx at x = 2, if y =6u^2-11 and u = 3x^2 +2

  • Thread starter srizen
  • Start date
  • #1
14
0
the only part im confused about is if i derive
y = 6u^2-11 first, then substitute u with 3x^2 +2.
or if i substitute u with 3x^2 +2, then expand/simplify, then derivate the entire question.

i got two answers.
using the first method f'(2) = 2016

and the second method f'(2) = 144

which method is right?

or am i just completely wrong.
 

Answers and Replies

  • #2
2nd method is correct and its answer is 2016
 
  • #3
14
0
2nd method is correct and its answer is 2016
alright, thx for the clarification
 

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