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