# Math Help - How do i factor this?

1. ## How do i factor this?

How do i factor this?

1331x^9 + 343y^6

2. Sum of cubes?
$\left( {11x^3 + 7y^2 } \right)\left( {121x^6 - 77x^3 y^2 + 49y^4 } \right)$

3. sum of two cubes factors as shown ...

$a^3 + b^3 = (a+b)(a^2 - ab + b^2)$

now note that ...

$1331x^9 + 343y^6 = (11x^3)^3 + (7y^2)^3$

4. Can you show how its done?

5. ok