21. Simplify the following: (x3 - 4x2 + 2x - 3)+(x + 2)

How do i do this activity, is appreciated

The graph of a function f(x)=(x+2)(x-4). which describes all of the values for which the graph is negative and increasing? all real values of x where x< -2 all real values of x where -2

In a column proof the right column states your reasons