I need help. Can someone explain how to do this please. (photo)

basically the number inside the 1st f( )of each problem must be plugged into all the it's in its equation an example would be with the first problem:

Step-by-step explanation:

1st:plug in the number inside the f(x) function into all the x's in the equation so #1 would look like this: f(x)=2-4, then solve for x

2nd your solution for #1 would be f(x)=-2

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.