Use (-b + or - sqrt(b^2-4ac))/(2a)
A is 10
B is -9
C is -6
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9x2-9x-10 = (3x+2)(3x-5) when factored
9x squared plus 16 = 0 factored is plus and minus 4/3 i.
With the help of the quadratic equation formula
(9x + 8)(9x - 8)
x = -2/3,7/6