Curriculum
Mathematics — First Preparatory
Unit 1: Numbers
0/10
Unit 2: Algebra
0/4
Unit 3: Statistics
0/6
Unit 4: Geometry
0/6
Text lesson
Algebraic Expressions and Formulas
Algebraic Expressions and Formulas
Common mistakes
Common mistakes
- Adding unlike terms. The wrong answer 3x + 2y = 5xy should not be written.
- Forgetting to change the signs when removing a bracket preceded by a minus sign. The correct form of −(x − 4) is −x + 4.
- Multiplying only the first term inside a bracket by the number in front of it.
- Squaring a negative number wrongly when substituting. If x = −3, then x² = 9.
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