Thread: find absolute minimum and maximum

1. find absolute minimum and maximum

X^4-72X^2+1 ON INTERVAL [-5, 13].....FIND ABSOLUTE MINIMUM and absolute maximum

I know i need the f'

but i am struggling

any help would be appreciated!!

2. $f'(x)=4x^3-144x$

Does this help?

*Remember, $(x^n)'=nx^{n-1}$