fINDING Y'

[meshun01]

6.) y=3x^4 - 2x^2 Find y'

Which one way is correct?
y'= 12x^3 - 4x

or y= 12x^3 * (-2x^2) + (-4x)*(3x^4)

 

[Gene]

d(ax^b)=abx^(b-1) so
y'= 12x^3 - 4x
is correct.