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12x to power of 2 minus 27x to power of 2.

I have tried to factorise this using two brackets but I could't work it out.

For example:

(3x-4y)(4x+8y) or (2x-4y)(6x+7y) will not work because there is no third number in the expression.

There as I think this should be alright:

3(4x to power of two - 9y to power of two)

Am I right?