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# Maths Factorising Puzzle watch

1. I know this may seem like an easy question but I would need some help.

Factorise completely 4y^9-81x^6
It does not say what it is equal to, I assume it equal to 0.
The nearest I have got is a weird looking (y^1.5 -x)(Y^1.5 +x)(2y-9x^2)(2y+9x^2)
Any help would be appreciated.

2. Can't think of anything else apart from difference of two squares
3. (Original post by TurkishMathsHelp)
I know this may seem like an easy question but I would need some help.

Factorise completely 4y^9-81x^6
It does not say what it is equal to, I assume it equal to 0.
The nearest I have got is a weird looking (y^1.5 -x)(Y^1.5 +x)(2y-9x^2)(2y+9x^2)
Any help would be appreciated.
I wouldn't have thought fractional powers were allowed for the variables.

You could treat it as the difference of two cubes.

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