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Write and evaluate algebraic expressions using variables.
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A variable is a letter (like , , or ) that represents an unknown number.
An algebraic expression contains numbers, variables, and operations.
| Expression | Meaning |
|---|---|
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| A number plus 5 |
| 3 times a number |
| A number divided by 2 |
| A number squared minus 4 |
Substitute the value of the variable and calculate.
Evaluate when :
Evaluate when :
Like terms have the same variable raised to the same power.
Remember: When writing expressions, is written as (skip the multiplication sign).