Edexcel AS Mathematics - Pure Mathematics 8MA0 15thMay19Watch
Can anyone explain to me how did you do question 16: Prove that n^3+2 is not divisible by 8.
(n^2+1)^3 + 2 = (n^6+3n^4+3n^2+1) + 2= n^6+3n^4+3n^2+3. There is no multiple of 8 ∴ not divisible by 8.
Not sure if this is correct tho