Question

"remove parentheses and simplify"
3m^{4} + m-5(m ^{4} + 7)

Answer 1

Hint: -5(r+3) = -5r - 15

Let's see what you get.

Answer 2

im lost

Answer 3

That's not good. You need to know the Distributive Property of Multiplication over Addition. Is is usually stated like this:

a(b+c) = ab + ac
or maybe
(b+c)a = ba + ca

You MUST know this property and be able to use it.
You will need it in your solution: "-5(m ^{4} + 7)"

Answer 4

thanks