Addition and Subtraction of Powers

Addition and subtraction of powers follows the same rules as algebraic expressions: $a^b+a^b=2a^b$. This is also the same if the power consists of numbers instead of variables.

Subtraction is the same:

$$\begin{array}{llll}\hfill b^2-b^2& =0& \hfill & \\ \hfill -b^2-b^2& =-2b^2& \hfill & \end{array}$$