Question

Find the sum of (x + 5), (-4x - 2) and (2x - 1)

Answer 1

Finding the 'sum' just means to add them together.
So you get
(x+5) + (-4x-2) + (2x-1)

Answer 2

Combine the like terms:
(x+5)+(-4x-2)+(2x-1)
Add the x terms together and then the rest if the numbers:
x-4x+2
and
5-2-1

That will be your answer