It is a difference of squares.
9x^2-49=(3x+7)(3x-7)
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(3x + 8)(3x - 8)
9x squared plus 16 = 0 factored is plus and minus 4/3 i.
(9x2 + 7)(9x2 - 7) = 81x4 - 49
That factors to 3x(3x - 1)
This is a difference of two squares, which factorises to: (3x - 4y)(3x + 4y)