integer solution in x^3+y^3+6xy=8

\hspace{-16}$Find all Integer solution $\mathbf{(x,y)}$ in $\mathbf{x^3+y^3+6xy=8}$

3 Answers

71
Vivek @ Born this Way ·

If we take x+y = 2 and Cube it,

We have x3+y3+6xy = 8

So any I think any two integers which satisfy x + y = 2, satisfy the equation. Please Correct me!

1357
Manish Shankar ·

hmm you are right.

we can also have:

x3+y3+(-2)3=3*x*y*(-2)

i.e. a3+b3+c3=3abc

then we have a+b+c=0

71
Vivek @ Born this Way ·

Yes Sir! x + y - 2 ≡ a + b + (-2)

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