Question

can anyone help me:

show that if (a,b)=1 then (a+b,a^2 -ab+b^2)=1 or 3

Answer 1

what does it mean (a,b) = 1? the left side is a coordinate, the right side is a number

Answer 2

it means the gcd of and b

Answer 3

ooooooh ok

Answer 4

i think you need to use the fact that \((a^2-ab+b^2)(x+b)=a^3-b^3\) probably

Answer 5

it is not coming to me right away sorry

Answer 6

let me try...thnks