If im not mistaken, it should be 2.
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If you mean: 9x2-36x+16 then it is not a perfect square because its discriminant is greater than zero
so 9x2 = -16. Doesnt work without going to imaginary numbers, x2 = -16/9 ie x = 4i/3
(3x + y)(3x - y)
-9x 2 -12x+5 =
-1