Symbols and notation
Plus-minus symbol
The plus-minus sign compactly represents two values or cases, one formed with addition and the other with subtraction.
In one sentence
What does Plus-minus symbol mean?
The plus-minus sign compactly represents two values or cases, one formed with addition and the other with subtraction.
How it is written
a±b
A compact example
The solutions x=(−b±√(b²−4ac))/(2a) use + for one quadratic root and − for the other.
Other names and search terms
±, plus or minus, plus-minus sign, positive or negative symbol.
Where this fits
When should you learn Plus-minus symbol?
The first encounter is not the final level. Many ideas begin visually, become computational in high school and become formal in college.
- 1Pre-high schoolPrepare foundations
- 2High schoolUsually introduced
- 3CollegeGreater depth
- 4AdvancedGreater depth
- Mathematical notation
- Algebra
- Reading equations
- Fluent formula reading
- Advanced mathematics
Recognising notation reduces friction when formulas become denser.
Open the Zero-to-QM pathClear answers
Questions about Plus-minus symbol
What does Plus-minus symbol mean in mathematics?
The plus-minus sign compactly represents two values or cases, one formed with addition and the other with subtraction.
How is Plus-minus symbol written?
A common notation is a±b.
What is an example of Plus-minus symbol?
The solutions x=(−b±√(b²−4ac))/(2a) use + for one quadratic root and − for the other.