## plus or minus

### The term “plus or minus” is used in mathematics to indicate that a quantity can have two possible values, one positive and one negative

The term “plus or minus” is used in mathematics to indicate that a quantity can have two possible values, one positive and one negative. It is denoted by the symbol ±.

For example, if we have the equation x² = 9, the solution can be expressed as x = ±3 because both 3 and -3 satisfy the equation.

Similarly, in algebra, when solving quadratic equations, we often encounter the quadratic formula x = (-b ± √(b² – 4ac)) / (2a). Here, the ± indicates that we need to consider both the positive and negative square root of the discriminant (b² – 4ac) to find the solutions to the equation.

In general, the “plus or minus” concept is widely used in mathematics to account for both positive and negative solutions when dealing with equations and other mathematical problems.

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