Simplifying means:

➡️ rewriting an expression in a cleaner, shorter, easier-to-read form
without changing its value.

You are not finding one number as the final answer (unless the expression has no variables).

Common simplifying actions:

✅ Combine like terms
✅ Use the distributive property
✅ Reduce fractions
✅ Remove parentheses
✅ Put in standard form

🔥 Example of simplifying

Expression:

4x + 2x – 3

Combine like terms:

6x – 3

✅ Simplified form:

6x – 3

Another example (with distributing)

3(x + 4)

Distribute the 3:

3x + 12

✅ Simplified form:

3x + 12

✅ What Does It Mean to Evaluate an Expression?

Evaluating means:

➡️ plugging in a number for the variable(s) and getting a final number answer

So you replace the variable with the given value, then do the math.

🔥 Example of evaluating

Expression:

2x + 5

Evaluate when x = 3:

Substitute:

2(3) + 5

Solve:

6 + 5 = 11

✅ Final answer: 11

⭐ Simplifying vs Evaluating (Easy Comparison)

Simplifying

• You keep the variables

• You make it shorter/cleaner

• Example:

7x + 2x = 9x

Evaluating

• You plug in numbers

• You get one final number

• Example:

9x when x=2=18