Math Definitions - Letter Z

Definition of Zero (of a function)

Definition of Zero (of a function)


Definition of Zero (of a function) | SubjectCoach

A zero of a function \(f(x) \) is a place where \(f(x) = 0\). In other words, it's a place where the graph of \(f(x)\) crosses the \(x\)-axis.

The function in the picture is \(f(x) = x^2 -1\). It crosses the \(x\)-axis at \(x = 1\) and \(x = -1\). So, it has zeroes at \(x = 1\) and \(x = -1\).

Many people call the zeroes of a function the "roots" of a function. They mean exactly the same thing.


The aim of this dictionary is to provide definitions to common mathematical terms. Students learn a new math skill every week at school, sometimes just before they start a new skill, if they want to look at what a specific term means, this is where this dictionary will become handy and a go-to guide for a student.


Year 1 to Year 12 students

Learning Objectives

Learn common math terms starting with letter Z

Author: Subject Coach
Added on: 4th Dec 2017

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