Explanation:
Given expression is
![8b -2b -4](https://img.qammunity.org/2021/formulas/mathematics/college/2613zodmilk3pveu5evmldrmmrft9kunni.png)
To simplify any expression we combine like terms
Any expression contains constant and variables.
the terms that contains variables are 8b and -2b .the constant term is -4
To simplify combine the like terms 8b and -2b
![8b-2b= 6b](https://img.qammunity.org/2021/formulas/mathematics/college/32rir4kstlgnmk48vw4oa9e2nouwuku54v.png)
![8b -2b -4](https://img.qammunity.org/2021/formulas/mathematics/college/2613zodmilk3pveu5evmldrmmrft9kunni.png)
![6b -4](https://img.qammunity.org/2021/formulas/mathematics/college/knb6wwxo9izxv90xb31dufvpdy7qkte6nr.png)
So the simplified expression is
![6b -4](https://img.qammunity.org/2021/formulas/mathematics/college/knb6wwxo9izxv90xb31dufvpdy7qkte6nr.png)