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Anonymous
9x2-9x-10 = (3x+2)(3x-5) when factored
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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
2x2-9x+4 = (2x-1)(x-4) when factored