How to add and subtract positive and negative numbers?

I have an easy method for u dude.
All u have to do is this.
Eg:- 1. +3 - -4
In positive side, there are 3 sticks or balls or whatever, but I will use sticks. In negative side, there are 4 sticks. Then u have to cut down negative to positive.
+ -
||| -
= - | (-1)

2. -7 + +15
+ -



= + (+8)

All except for b, because polynomial functions can be quadratic, cubic, witticisms and etc only non negative exponents of negative it is not a polynomial function