9x squared plus 16 = 0 factored is plus and minus 4/3 i.
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(9x)2 +9x/(45x)2 +81= 9+9x/86
Let the symbol ^ mean "to the power" Then 9x^2 + 24x + 16 = (3x + 4)(3x +4) = (3x + 4)^2
(9x + 7)(x - 2)
This is (3x +2)2 so if x is an integer/3, this expression is the square of an integer so cannot be prime. Anything else, and it's not even an integer.
9x squared-15x squared = -6