This is a difference of two squares, which factorises to:
(3x - 4y)(3x + 4y)
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9x squared plus 16 = 0 factored is plus and minus 4/3 i.
It is: (x-2)(x-7) when factored
That factors to 3x(3x - 1)
(3x + 8)(3x - 8)
It is a difference of squares. 9x^2-49=(3x+7)(3x-7)