Answer:

Step-by-step explanation:
The standard form of an equation of a parabola:

We have
<em>use distributive property: a(b + c) = ab + ac</em>

<em>use FOIL: (a + b)(c + d) = ac+ ad + bc + bd</em>

<em>combine like terms</em>

Answer: -4m-n
Step-by-step explanation:
5m-13m-n+4m
5m-13m+4m-n
-8m+4m-n
-4m-n