(5x-12)(5x+12

5x(2x^3-7x^2+3)

(6 +/- sqrt (4))/2 => 3+/- 1 => x=4, x=2

(-4+/-sqrt(-40))/2 => -2+/- sqrt(10)*imaginary

(-6+/-sqrt(96))/-6 => -1 +/- 2sqrt(6)/3

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