Letters are used in algebra in place of an unknown number, giving us algebraic terms like 2x. When algebraic terms are combined with mathematical operations, eg + or - we get an algebraic expression.

Remember that any term containing the same letter can be combined by adding and subtracting.

So:

Like terms that include powers can only be added or subtracted if the powers are the same. Like terms with different powers cannot be added or subtracted.

Simplify:

Rearrange the expression so that like terms with the same powers are next to each other:

And then simplify:

We usually write the expression with the term first, then the term, and finally the number term.

- Question
Simplify:

To get the answer, rearrange the expression:

and then simplify: