Help! Fan + Medal

Consider the function y = 3x5 – 25x3 + 60x + 1. Find the critical points of this function.

None
–2, –1, 0, 1, 2
–2, –1, 1, 2
1, 2
–2, 2

Question

Help! Fan + Medal 

 Consider the function y = 3x5 – 25x3 + 60x + 1. Find the critical points of this function. 

       None
       –2, –1, 0, 1, 2
       –2, –1, 1, 2
       1, 2
       –2, 2

p0sitr0n · Answer

you find the critical points of a function (extremums) by taking f'(x)=0

anonymous · Answer

I think its B but I want to make sure, you know

anonymous · Answer

But I tend to suck at taking derivatives of functions thats why I always want someone else's opinion

p0sitr0n · Answer

f'(x)=15x^4-75x^2+60=0
then solution space is : x =+-1, +-2

p0sitr0n · Answer

use the power rule $$\frac{ \delta x^n  }{ \delta x } = n x^{n-1}$$

anonymous · Answer

alrighty

anonymous · Answer

So I got -2,-1,1,2 again so I am guessing that's the right answer. Thanks :]