# How to write infinity in interval notation  How to Express Your Answer in Interval Notation Sciencing I can solve this by surrounding the whole value in braces, but then the spacing around the equal sign is still not correct. Interval notation is a simplified form of writing the solution to an inequality or system of. In the example, the lower bound of x is negative infinity, so write "-∞.". How to Write Interval Notations Using the Infinity Symbol on a. For other combinations of intervals and operators, different spacing inconsistencies arise. A parabola is a symmetrical curve with a vertex that represents its minimum or maximum. The two mirroring sides of the parabola change in opposite ways one. Intervals and interval notation video Khan Academy What is the correct and easy way to input intervals in order to avoid having to take care of this at all? We can use interval notation to show that a value falls between two endpoints. For example, -3≤x≤2, -3,2, and {x∈ℝ-3≤x≤2} all mean that x is between -3 and 2 and. So is it better to use '' and '' brackets before and after the infinity?