I need help. I have no idea how to find derivatives.

3. Use the function , and its first and second derivatives to answer the following parts . 2x 2(x +36 ) 4 x ( x2+ 108) 9 ( x) = x2-36 9" ( x ) = ( x2 -36) 3 ( a) Find the interval(s) where , is increasing and decreasing. ( state clearly) ( b) Find the intervales) where , is concave up and concave down. ( state clearly) ( C) Does. 9 have any relative extrema? If so, explain why and state them in ( xy) form. ( d ) Does , have any inflection points? If so , explain why and state them in ( *,y ) form