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9x squared plus 16 = 0 factored is plus and minus 4/3 i.
2x2-9x+4 = (2x-1)(x-4) when factored
(x + 3)(3x - 2)
x2-9x+8=0 has two solutions:x = 8x = 1
9x2-9x-10 = (3x+2)(3x-5) when factored