Math Problem Statement

aを正の整数とする。a+1が3の倍数であるとき、a² ーa+1 は3の倍数であるが9の倍数ではないことを示せ

Solution

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Modular Arithmetic
Quadratic Expressions

Formulas

a^2 - a + 1
(3k - 1)^2 = 9k^2 - 6k + 1

Theorems

Divisibility by 3
Divisibility by 9

Suitable Grade Level

Grades 9-12