"We should seek the greatest value of our action."
- Stephen Hawking

Each link above takes you to a section of this website that contains material developed specifically for the purposes identified.

Android Apps

Introduction

A new addition to the www.mathguy.us website in 2018, the Android Apps represent our attempt to bring some of the items available in the PC Apps to Android cell phones. They are designed to help students learn by "playing" with the math they are learning. For example, what happens to the graph of a quadratic equation if you change the value of "b?" Our hope is that the apps will enhance the student's learning experience.

The Android Apps available on this page were written in the Kotlin programming language, using Android Studio. They require at least Android 7 (Nougat) to run on a phone. They do not run on iPhones.

These apps are not available in the Google Store. As they are enhanced, updated versions will be made available on this site.

Because the apps are in development, please use them with care. We have made significant efforts to make sure the results are accurate, but you should always challenge the results to see if they are consistent with what you know. If you get a result that you believe is incorrect, please ask your teacher or email Earl at .

The following Android Apps are currently available on this site. We will add to the list as others are developed.

Number Explorer App

This is the successor to the FactorIt App. It has the following capabilities:

• Factor a number into its prime factorization.
• Determine if a number is prime.
• Find all the proper divisors (factors) of a number.
• Find the greatest common factor (GCF) and the least common multiple (LCM) of a number.
• Check the divisibility of a number by the numbers 2 to 10 and the next 9 primes, all with one click.

Enter a quadratic function definition in Standard (also called General), Vertex or Intercept form. The app will provide the equivalent equations for all three forms, along with the vertex, axis of symmetry, concavity, x- and y-intercepts, maximum or minimum, transformations and end behvaior of the function. Determining exact zeros, either real or complex, is achieved with the press of a button, as is completing the square. Additionally, you can plot the function and show its vertex and axis of symmetry on the graph. An explanation is also provided for the parameters involved in each equation form.

Parameters may be input as integers or decimals. The user can define the number of decimals to show in the solutions provided.

When you click on one of the download links above, Android will attempt to install the app's associated APK file.

Install

In order to install an app on your phone: