Question

for what values of x does f(x)= 8x^4-4x^2 have a rel min.

Answer 1

second derivative =?

Answer 2

ahhhhhhh i used the first derivative test and got 1/2 only. Is this correct?

Answer 3

relative max/min, consider by second deri

Answer 4

there is also a first derivative test. And you get the critical numbers and test points in the derivative