I really need on these cause I really don't know this and I need to understand. please help me please.

Answer:
-6m^4-m^3
Step-by-step explanation:
First you move the parenthesis then you group the like terms after you group the like terms you get [tex]m^4-7m^4-m^3[/tex] which is adding the similar elements and after you add similar elements you get -6m^4-m^3. Srry if this makes no sense
Answer:
[tex] { - 6m}^{4} - {m}^{3} [/tex]
Step-by-step explanation:
If you want to simplify the equation this is the way to do it.
You have to collect the like terms. (-7m^3 + 6m^3) = -m^3 and (-7m^4 + m^4)= -6m^4
The term with the greater exponent goes first so the equation will look like this.