Algebra 2 Help

First one...

The low point on the graph on  this  interval  = -36  =  relative min

The high point on the graph on this interval  = 64 =  relative max

Second one

(f + g) (x)  =   f(x) + g(x)   =  [ x^2 - 36 ]  +  [ x^3 + 2x^2 - 10  ]   =   x^3 + 3x^2 - 46

Last one

(f * g)  (x)   =  f(x) * g(x)   =  (x^4 - 9) ( x^3 + 9)  =   x^4 *x^3 + 9x^4 - 9x^3  - 9 * 9  =  x^7 + 9x^4 - 9x^3 -  81