ALG008 · Algebraic expressions · Classes 7–9
Simplifying expressions
Simplifying an expression means collecting like terms (watching the signs) until no two terms are alike.
5x + 3 − 2x − 7Simplifying expressions
📐 Formula
collect x-terms and constants separately
✏️ Worked example
(5x + 3) + (−2x − 7) = 3x − 4. Red tiles (negative) cancel matching positive ones.
🌍 Where it is used
Making formulas shorter before substituting values.
❓ Quick check
Simplify 4y − 9 − y + 2.
🏋️ Practice
EasySimplify 8m − 3m.
Answer: 5m
MediumSimplify 2(x + 3) + 4x.
Answer: 6x + 6
ChallengeSimplify 3a² + 2a − a² + 5a.
Answer: 2a² + 7a